#wd gaster reader insert
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You'd never been scared of a monster before you met him.
A little spooked sometimes? Sure, especially at the one that also shopped Saturday morning at your favorite grocery store, the one that looked like a sentient inkblot test. That fellow took a bit of getting used to.
A little human-ly disturbed? Absolutely, particularly by the ‘liquid horror amalgamation of Dogs that screamed in thirteen voices’ who you often saw with their family members at the park you ran at. After the first few times they'd barreled towards you shrieking a greeting, you'd started to almost get used to them, mostly thanks to their brothers and sisters who came sprinting behind them with horrified expressions to try to intervene.
All in all, you didn't really understand the societal horror of monsters that some humans clung to, even after so much time. Sure, they were inhuman… but obviously they were going to be, what else did people expect? And with your lack of fear came business opportunities galore.
#spring cleaning fic#undertale fanfiction#gaster x reader#wd gaster reader insert#wd gaster and reader#gaster x you#wd gaster#gaster#undertale gaster
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Don't Forget
[Sans x Female!Reader]
35: Chat, I Think He Likes You
♪────✿(✧◕ᴗ◕✧)✿────♪
It’s been fucking hours, you know it has been! Hours of searching around the forest of downtown Snowdin and you couldn’t find shit!
You were useless since you couldn’t detect anything without magic. Sans and S-Papyrus were playing “Hot or Cold” trying to locate the source of this irritating feeling that was messing with their magic. But alas, their search came up empty.
Sans was kind enough to explain it to you to the best of his abilities on the walk back.
“imagine if there was a constant high pitch noise in your ear that was loud enough for you to constantly hear, but quiet enough that it can still blend in the background. but the sound is also at a terrible pitch anyway. but not only that–have you ever listened to music with the bass so high, that you can feel the vibration in your chest? and, imagine swallowing cotton balls. no matter how much water you drink to get rid of it, there’s always gonna be a few lints clinging inside your throat.”
“…”
You’re fucking thankful you can’t feel it. That’s such a sensory overload–it’s horrible just trying to imagine it!
“yeah,” Sans laughed at your expression, “all of that happening at the exact same time. that’s what it’s like. but instead of physically dealing with it, it’s like all of those sensations are caused emotionally. for us monsters, especially monsters like me, our magic is insanely tuned with our feelings. that’s the best i can do for you.”
“Brother, eugh.”
No wonder S-Papyrus has been on edge lately. If he really has been in this area this whole time for weeks trying to look for the source, you’d be fucking murderous.
It got to the point where even Sans was walking at a distance from you on the way back to S-Papyrus’ home. He said he was too overwhelmed and didn’t want to hurt your feelings on accident.
Reasonable crash out, honestly.
The walk home is quiet and carries an air of defeat. You’re all tired and can use a good night's sleep to cry about it while you snooze. You’re not looking forward to sleeping in the Capture Zone if you’re being real. Maybe you can somehow convince S-Papyrus to at least let Sans sleep in the living room if nothing else.
As you’re nearing the house, you spot a few monsters here and there, smiling and waving when they look at you. You don’t recognize any of them, they must’ve been switched with the others that you’re familiar with.
Aw, wait!
You almost stop walking but force yourself to keep going.
Fucking… Grillby’s Restaurant…
Passing by it, you read “Muffet’s” on the sign instead of the fire-man��s name.
Man…
Wait, so does that mean that Grillby would technically be the one who has a boss fight in this Au? That’s kind of hot if you think about it. You’d be down for a feral Grillby, you’d wanna see that.
Finally making it back to the house, Sans is already putting his hand on your wrist, pulling you to the Capture Zone. You assume he wants to just go to sleep already. You want to ask S-Papyrus to let Sans sleep indoors, but judging by the shorter skeleton's mood, he probably doesn’t want to be separated from you right now.
“hey. wait.”
Sans stops at S-Papyrus’ voice however he doesn’t turn around to look at him. You do though, you’ll be his eyes if he’s not going to look. S-Papyrus grimaces while looking at the shed.
“you two… ugh. there isn’t room, but if you’re willing…” Wow, S-Papyrus looks like this is physically painful for him, “you and the other sans can share the living room.”
You light up with a wide smile, nodding before Sans can possibly protest. “Yes! Thank you so much! Sans!”
He begrudgingly turns around, looking right at you.
“Say thank you to Mr. Papyrus.”
“…thanks, man.”
“…don’t mention it.” He grimaces and turns around to open the front door, “literally.”
“already filed and locked away.”
“Awe, you guys are so wholesome,” Sacchariferously and sarcastically, you clap your hands together, “If only we can keep this nice energy forever.”
…The other two are too tired and irritated with today's events to even reply. Dang, tough crowd.
You’re given a single pillow and a single blanket from S-Papyrus. He said something like how Sans doesn’t really need anything since the floor will be comfortable enough for him. Sans couldn’t defend himself from this slander since he was in the washroom to clean himself up. You didn’t say anything, but you already know how you’re going to fix this situation.
“tomorrow, i was planning to go back there to keep searching. that’s why i wanted to sleep in early,” S-Papyrus was telling you suddenly as you were fixing up the couch, “since we’re all going there anyway, i might as well just keep going with you and–him.”
“That’d be great, Papyrus,” You smile at him, “We can use all the help we can get, thank you.”
“ugh, you’re way too nice,” He sighs, rubbing the side of his face, “it makes me wonder…”
“Hm? About what?”
“if there’s gonna be a version of you that’ll show up here. if you did, would she be as nice as you? or am i gonna have something to worry about?”
You falter in your moments. You didn’t consider that at all. Not really. At least, not in the way S-Papyrus has.
If the roles were reversed, would it actually be you who shows up? Or maybe… Would it be your best friend, Elliot? He was technically “with you” the day this happened. You guess in a Swapped Au, Elliot would be in your position instead. But even then, he would just have your personality/role, wouldn’t he?
Oh, God. Would that mean in the Swap Au, Elliot would be dating Sans–no… Papyrus?! Or maybe nothing romantic would happen, but where would that leave you anyway?
This is weird to think about. You’re going to stop thinking about it.
“I wish I had an answer for you, but… I’m not an expert on these things. I quite literally just came along for the ride,” You answer truthfully, but you refuse to turn around. “If for some reason, my counterpart shows up here, I think you’d be in good hands. I can’t imagine a version of myself where I’m violent.”
You refuse to turn around because he would’ve seen just how much of a fucking liar you were. Your LV tells a different story, and you are fully capable of violence–your entire past is violent and gruesome. Were it not for Kōrenki’s involvement, you would probably still be a shit person.
S-Papyrus hums in contemplation. He mumbles a goodnight and just leaves to his room upstairs.
Wow.
Inch resting.
You finish setting up the couch and give it a good look.
[ You’re taller than Sans / You’re about the same height as Sans / Unfortunately you lost the lottery and are somehow shorter than Sans ], but either way, you think if you just cuddle with him, you two can squeeze together on the couch.
Nodding to yourself, you start to undress yourself. You know Sans has completely forgotten by now, but you DID pack for this adventure. Sans had stored it away in that Void of his that you never ask about because that’s too much to think about-
Anyway! You have packed clothes, and you don’t want to sleep in your snow-dirtied clothes. You remove your jacket and are about to take off your shirt too.
“hey!”
You stop and find the source of the whisper-shout. Sans had shortcut to the bottom of the stairs, a blush on his face while narrowing his eyes.
You raise a brow, “Yeees?”
“you weren’t going to seriously strip out here, please tell me you weren’t!”
“It’s not a big deal…” You lower the hem of your shirt anyway because he looks like he’s about ready to fucking shit himself. “By the way, don’t forget you have our stuff in your fucky-wucky shortcut void thingy.”
Sans looks up the stairs, snapping his fingers at the same time. Your duffel bag appears on the couch in one piece. You step to it to pull out your sleep clothes.
“[y/n],” Sans whispers with some anxiety, stepping towards you, “i really don’t wanna be that kind of guy, but please don’t get naked out in the open at someone else’s home.”
Your smile is involuntary: “I think it’s sweet you’re conscientious about these things. I understand though. I’ll be right back, then.”
Sans shoulders drop with relief. Geez, he must’ve been really scared to tell you anything in the first place. You hope it’s not because he thought you would blow up in his face about it. You want him to be comfortable with coming to you about things that make him uncomfortable.
This is gonna be a bumpy road for you, if you’re honest. You got used to being shameless and not being involved romantically with someone else. You have to remind yourself that, while Sans by no means owns your body, you need to be considerate about his feelings when it comes to things like that.
“thanks, i appreciate it.” Sans snaps his fingers again, his own bag appearing next to your duffel bag.
As you walk by him to change in the washroom, you stop to lightly kiss his cheek. “Thanks for telling me, by the way.”
He looks away with a blush and his smile relaxes. “i–yeah. i don’t want to tell you what to do-”
“-No, no. You’re allowed to feel this way if it bothers you,” You reassure him, “And really, I need to get used to being with someone again. So… You know, if I do shit that really bothers you, I’d rather you tell me so I don’t keep doing it and make it worse.”
Your sweet boy nods, looking at you with bigger eye-lights. It reminds you of a cat when they’re looking at the human that they love so much.
…Sans is like your kitty…
“okay, i’ll try. and you’ll tell me too, okay? i’m far from the perfect partner, i know i’ll fuck shit up sometimes, too.”
You shake your head and continue up the stairs, “I think you’re doing pretty good so far, Sans. Besides, trial and error are all part of a relationship. Sunshine all the time makes a desert, and all that jizz.”
Sans was going to reply with his own cheesy ass quote, but that last part threw him off.
“don’t you mean jazz?”
“….Anyway, I gotta change.”
Dang.
Sans is now left with your final jizz as you hurry to the washroom.
He changes into cleaner clothes as well, feeling icky from all that walking around today. This is a lot more labor than he’s used to since he loves doing absolutely nothing. Of course that changes when you have someone important in your life to mix it up.
Sans can’t say he hates it, not at all.
This day though…
Ugh, it’s such a fucking mess.
Immediately getting caught by this Au’s version of himself, having tension between Swap-Papyrus, and keeping a constant eye on you to make sure you’re okay… It takes a lot out of a skeleton, believe it or not.
Having the Judge role, of course, S-Papyrus will be the most suspicious of them. It makes your journey more complicated, but Sans hasn’t been fighting it for one reason. Two reasons, actually, since you brought it up earlier.
Sans does not believe in coincidences. If getting caught happened so soon after their arrival, then it must be because it was meant to happen. And now on top of that, you’re so insistent that you shouldn’t be hiding the true motives from their counterparts because of this “strange feeling” you have.
Considering you’re also a key in all this, Sans must rely on your intuition as well. Even if trusting someone other than himself (and Papyrus) scares the fucking hell out of him.
Sans has faith in his ability to keep you safe, at least. If all else fails, he can keep you safe.
Not that it’s completely necessary. Today he learned that you’re, apparently, decent enough around a fight. Well no, Sans always figured that you had to be some kind of fighter with that insane strength of yours. Having it confirmed is a whole other thing.
Man, Sans really wants to check out your soul to look at your stats. He’s so fucking curious. Ah, but not that curious. He’s not sure if he can handle the idea of someone loving and trusting him enough to willingly show him their soul.
Someone as great as you showing your soul to him just because you love him…
Sans allows himself to daydream it for a few seconds.
It leaves him red and embarrassed to hell and back. He needs to take a seat on the couch to pull himself together.
What a lovely thought, though…
Sans flinches at the sound of you coming back downstairs. He stands up and straightens out his shirt. He doesn’t know where the hell he should put his dirty clothes…
Your clothes are already folded, and you simply put them on top of your bag. You move it next to the couch almost like it was routine. Sans supposes that it must be considering you were living on his couch for a month. He kind of feels bad that it took so long for them to decide to move you into his room.
“Hey,” You draw his attention to you, taking his dirty clothes from him, “We’re gonna share the couch, is that okay?”
Sans eyes the piece of furniture, “uh… we can fit if we… uh, are you okay with, you know, cuddling?”
You grin at him. “Hearing you say cute words like that is so funny.”
Why must you always tease him this way?
“how is it funny?”
“‘Cause you got a deep voice. It’s a sexy voice though, you’d make fucking bank doing Boyfriend ASMR videos.”
Sans is already getting used to the fact that his face is going to be blushing around you. He’s made peace with it.
“heh, i like hearing you talk, too. a lot.”
“You’re so cute,” You’ve been folding his clothes this whole time. “Are you ready to sleep, then?”
Sans shakes his head, watching you put his clothes on top of his bag. You move it next to your own bag, making sure it’s neat. You’re so demure. He likes that.
“not yet. i wanna write this all in my journal. i gotta make sure the mini-dj isn’t busted, either.”
You sit down on the couch, “Need any help with the mini-dj?”
He pauses, “do you know how?”
“No, not at all. I just wanna be useful.”
Sans snorts, “you know what would help me a lot?”
You deadpan, already know where this is going. “What?”
The skeleton moves so he’s standing in front of you. He puts a hand on your head and leans over, kissing your forehead sweetly.
“getting some rest,” He says quietly, “you’ve been moving all day, but you fainted earlier, remember? i was worried all day about you.”
You sigh out of your nose in defeat, “Fine. I’ll try sleeping. For you. But you better know how reluctant and disgruntled I am about this.”
“thank you, feeling better already.”
This time, he leans lower to peck your cheek. The action makes you smile like a little bitch, fucking cheesing over here on the damn couch. Sans is a lot nicer than you, he doesn’t tease you about your reaction. Or maybe because his mind is preoccupied with the things he brought up earlier.
You get comfortable on the couch and lay down, pulling the cover over your body to get all cozy. Sans moves to the small table on the left side of the couch where it holds the Quantum Physics joke book. He puts it on the floor so it’s not in the way. Snapping his fingers, he pulls his trusty journal and pen from his Void.
The lights in the house are off, leaving the only source of light from Sans’ face. You know what that is, but tell yourself it’s better if you don’t check for yourself. His scribbling and muttering are soothing in the house.
This house is identical to the one back home, but it still feels like a stranger's home. You’re staring up at the ceiling, have been for the better part of the last 30 minutes.
You can’t fucking sleep. You’re tired too, but you can’t sleep.
You sit up the moment you hear Sans no longer writing. Sans is looking over the mini-dj, but that’s all. Maybe because there isn’t anything wrong with it after all. Feeling your stare, the skeleton turns his head to you.
Oh, wow. He’s not even hiding his glowing eye from you.
His right eye-light is replaced by a ring of swirling cyan and bright yellow. The brightness is enough that it illuminates your face and the wall behind you. It’s not blinding, and you don’t feel scared staring into it like you thought you would be.
It’s beautiful, actually.
He blinks at you with a confused smile, “have you been awake this whole time?”
You nod.
“[y/n]… go to bed.”
Raising your voice without yelling, you demand: “Join me, then.”
Sans simply sighs in defeat. He knows damn well you’re not sleeping without him, and doesn't fight back. He snaps the pen, notebook, and mini-dj away and stands up with a quiet grunt. He makes sure to put the Quantum Physics book to where it was before walking to the couch.
You grin at him while moving the covers, “You’re super light, it’ll be better if you sleep on me.”
Thanks to his glowing eye, you can see his blush and sheepish look easily. “i wanted to be the small spoon, anyway.”
“Yeah, yeah. Come here.”
Sans carefully climbs over you, making sure not to dig into your limps with his bony knees. With magic, you presume, he’s able to rest comfortably on you without his ribs bothering you. Sans adjusts the cover over you two, wiggling slightly to get comfortable.
He kind of feels like a weighted blanket.
It’s nice.
“are you good?” He whispers so softly.
“Mhm,” You wrap your arms around him, “goodnight, baby boy.”
“ugh. goodnight.”
Fucking score!
Closing your eyes, you find that you’re suddenly exhausted. You’re so fucking corny, did you actually need Sans with you for you to sleep? Perhaps you felt safer to sleep with him right here. Or maybe you really did need a weighted blanket.
Whatever the reason it may be, you fall asleep rather quickly this time.
…
…
…
Nothing.
Behind your eyes in the unconsciousness, there’s nothing. Swirls of nothing. Different shades of nothing.
Until there’s something else.
In the depths of the abyss in your unconscious mind, you see a man. A skeleton, in your dreams.
You immediately recognize who this is supposed to be.
“☟︎♏︎●︎●︎□︎📪︎ ☯︎✡︎📭︎■︎☸︎.”
☹︎♏︎t’s fix th♋︎t.
The man who speaks in hands clears his throat. This time when he speaks, you can understand exactly what he is saying.
“Hello, [Y/n].”
────────
A/N: I drew hims. The mans, the myths, the legends: Mr. W.D. Gaster

Tags:
@lemonboy011
@adriixboo
@fetusbaconegg
@fluffyart5000
#fanfiction#reader insert#female reader#don't forget fanfiction#sans x reader#undertale#sans undertale#sans#underswap sans#underswap#underswap papyrus#gaster#wd gaster#fanart
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I black…all I can see is black.
I try to find anything other than black but I can’t. I am somehow standing even though I don’t see any solid ground. My head is pounding and I feel as if my skull has been hit with a frying pan.
Whoosh
I hear a noise behind me and turn around quickly but not seeing anything or anyone.
Whoosh
I turn around again now feeling dizzy a bit from the turning.
“Show yourself!” I exclaimed tired of the silence. Unfortunately getting what I asked for.
A tall skeletal figure appeared in front of me, his appearance terrifying. His skull was an oval shape with deep slits going up from one eye and down the other, he seemed to have an almost permanent smile carved into his face. He didn’t have eyeballs instead he had two pinpricks of light resembling his pupils. His hands also skeletal in nature but with holes punched into them.
“H-hello…oh you’re terrifying..” I said intimidated by his height
☟︎□︎⬥︎ ♋︎❒︎♏︎ ⍓︎□︎◆︎ ♒︎♏︎❒︎♏︎✍︎ ☠︎□︎ □︎■︎♏︎ ♓︎⬧︎
⬧︎◆︎◻︎◻︎□︎⬧︎♏︎♎︎ ⧫︎□︎ ♏︎❖︎♏︎■︎ ♌︎♏︎ ♋︎♌︎●︎♏︎ ⧫︎□︎ ♑︎♏︎⧫︎
⧫︎□︎ ⧫︎♒︎♓︎⬧︎ ◻︎●︎♋︎♍︎♏︎📬︎
I blink confused “I’m um sorry but I can’t understand you” I said softly and watch as the figure nodded understanding. I was about to ask something else but I could feel my body pulling me out of the darkness.
I woke up in my bed sweating and panting and I look at the clock “shit! I’m late to work!”
Fin
(Translation
I don’t know if all of the Wingdings things are accurate so I apologize for that)
How are you here? No one is supposed to even be able to get to this place.)
I’ve decided I’m going to start making chapters
I have not named the character so if y’all wanna name her go ahead I plan on having multiple love interests for people to chose from.
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Decided to indulge in one of the Papyrus x Reader posts from @jacketbones . Littletale Papyrus and Reader are *chefs kiss*. Best wholesome friends.




#my art#doodle#papyrus x reader#let them illegally hold puppies Gaster#undertale related#papyrus#wd gaster#self insert#littletale#littletale papyrus#undertale#noodle's art
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I'm learning how to art
Here's something I did for @buglespider. I promised that I'd do ship art of her and Gaster :))
#biters art#gaster#wd gaster#w.d. gaster#wingdings gaster#wingdings#undertale#gaster x reader#x reader#gaster x self insert#self insert#undertale x self insert#buglespider#mutual#friend
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Chapter 14!
(this one’s a bit of a longer one, but the ending is worth it I promise)
#gaster x reader#gasterxreader#gaster x you#reader insert#wd gaster#undertale#slow burn#fanfic#ao3#in the name of science#ITNOS#dimetrodon
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Sorry but why Sessrins head over heels for Rin ? If I didn’t watch Inuyahsa, I would said Rin was the popular character in Inuyahsa not Sesshomaru
LOL the amount of fan content for a character that is as flat as a glass of water in this fandom is hilarious. The only character I can think of who has less known about them and more fan content is WD Gaster, but at least that mofo has ACTUAL MYSTERY and INTRIGUE to him.
The way I see it though, is it's Bella Swan syndrome. They all love Rin even though she has no character, lines, and is basically fridged at this point is because they all want to fuck Sesshomaru, so they self-insert into her. The fact that she has absolutely zero character makes it easier for them all to reflect their own character onto her, and make her whoever they want her to be.
Which to be totally honest, fine, I don't care. There are plenty of characters like this in the romance genre, and I sleep (sometimes I enjoy a reader insert story myself here and there). But what gets me is how they cannot seem to empathize with with their fellow fans who DO NOT self-insert, and see Rin for what she has been written as: a little girl who is barely into the cusp of adulthood and already bearing children for an older, more experience male character who had a very big impact on her life growing up, and all of this for an audience of children in a similar age-range.
I UNDERSTAND why they like her, but I am PISSED that despite the fact I have said this multiple times, and I have even argued against calling them pedophiles (because it's clear their interest at the end of the day isn't the underaged girl, it's BEING the underaged girl), they cannot have the same basic decency to understand things from our point of view either.
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TSM Update Soon
Expect tomorrow, just adding the finishing touches tonight with @allocatealoe.
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Spring Cleaning Chapter 3- UGH WHY WON'T THE LINK POSTING THINGY WORK SOMETIMES THIS IS SO CLUNKY AND NOT CUTE.....ahem
You gasped against his lips, stuttering for a moment as outrage flipped to her twin-sister passion, then fisted your hands in his shirt and kissed him back like you were starving.
It was deranged, graceless and delicious- he licked into your mouth with a groan and the noise shot straight down to the apex of your thighs. The man kissed like he did everything else in life- with complete focus -catching your lips again and again between rough gasps for air that made your belly clench with need for how authentic they were. Soon, you had to tear yourself away, panting like you'd been sprinting while you dragged your lips down his neck, sucking the little curves of bone there and making his hips jump underneath you with each touch. “Stupid! Idiot!” You pressed the words into him with kisses; in return, he gripped you by the hair in a way that made your knees go weak and dragged your mouth back to his.
#spring cleaning fic#undertale fanfiction#wd gaster#gaster#gaster x reader#gaster x you#wd gaster and reader#wd gaster reader insert#undertale
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You stepped away to grab a change of clothes from your office, and Gaster had to take a moment to sit and rest his head back against the chair. The direction his life had taken…how was it possible to be so happy? He'd already wondered at his own luck over and over, nearly driving himself into a moment of existential crisis trying to figure out how on earth, in all the near infinite places he could have ended up when he'd burned himself back into existence, that it had been in your home. In your arms.
And not only had you helped him, saved him… but somehow, you had been interested in him seemingly from the beginning? In what world was he such a lucky person?!
In the large dining room, Grace and two of your other employees were just finishing up with the food service; she brought him a left over plate of the stuffed dates he'd loved so much all night with a wink, then meandered back out to help carry any last trivets and dishes over to your dishwasher. He took a bite of one, inwardly groaning at how good they were- perhaps he'd be able to convince you to make these just for himself, sometime. Then a knock came at the doorway; Sans stuck his head in.
“phew. didn't want to walk in on anything blinding.” While Gaster rolled his eyes, his brother grinned. “we'll be doing presents tomorrow around eleven, if you guys wanna join us. pap is dying to give her his gift.”
#christmas cookies fic#undertale#undertale fanfiction#gaster x reader#gaster#wd gaster#undertale gaster#gaster x you#wd gaster and reader#wd gaster reader insert
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Don't Forget
[Sans x Female!Reader]
36: Alright, Dude. What. The Flip.
♪────✿(✧◕ᴗ◕✧)✿────♪
When Gaster appeared in your dreams like this, he wasn’t exactly expecting a warm welcome or anything like that. Maybe a scream or a jump, something to spook you a lil’ as a little late-night trolling.
What Gaster wasn’t expecting was for you to immediately shout profanities at him.
He stands there awkwardly like the man-standing emoji.
🧍
All he can do is wait and twiddle his thumbs as you call him a beta bitch for the 17th time in 39 seconds. He almost wants to cry; why are you yelling at him? Is this really Sans’ type? Is this what the kids are into these days?
You stop pacing around in the endless void that is your subconsciousness. Putting your hands on your sassy hips, you look at him with an irritated and expectant look.
“Well?” You huff, “What the hell are you doing here?”
“…Are you done?” He asks.
You noticed that as he was talking, his hands (God, it’s so freaky. He does not have arms and his hands are not attached to his body. Seeing them with holes in the palms in person is a lot scarier than you thought it would be.) twitched upward, almost like he wanted to talk with them. You can somehow understand him now, but maybe he would feel better with some help?
Bringing your dominant hand up in a fist, you move it up and down in a nodding motion. “…Yes.”
“Thank you.”
He moves his left hand up to his mouth, palm facing his chin, then brings his hand outwards. The motion can be similar to blowing a kiss, but you know it’s sign for what he just said.
Looks like Gaster would much rather prefer speaking in Sign Language. That’s fine with you, you don’t mind having to do so for his comfort. It works out for you, too. Just because you can understand him now, that doesn’t get rid of this strange gibberish sound that seems to follow closely after his words.
Gaster continues to talk, and at the same time, he keeps using sign. “You should already know who I am.”
You snort, doing the same, “Yeah, that’s why I asked why are you here, not who you are.”
“…Oh.”
Nuh, God. This guy is so much like his son. A fucking dork.
Gaster is… not what you were expecting. His body is tall, probably over 7 feet tall. He’s almost lanky in stature, hunching over but you don’t think that’s of his own will. There are parts of him that are smokey and wispy, almost as if he’s incomplete (which you suppose he is…).
[ Despite being a tall bitch yourself, this guy still managed to be taller than you. / You’re considered to be average in height, so this man easily has height over you. / You’re already struggling in life being short, so imagine your horror when this monster is practically a fucking mountain compared to you. ]
His skull is not skeletal but the visual texture is similar to Sans’ and Papyrus’. Aka: bony as fuck. His right socket is normal and wide naturally, while his left eye is droopy in a forced-shut kind of way. The crack that starts on the tip of his head leading to his left socket is what forces it to be half-lidded.
His smile–his beautiful, baby boy smile–freaks you out the most.
He doesn’t have lips, no. But yet you can’t see the joints of his jaw the way you can with Sans and Papyrus. It’s almost like lips, but you know it’s not supposed to be.
Perks of being a monster, you suppose.
His drip is fucking immaculate though. A pearl-white turtle neck shirt that’s thick and hides his entire neck. Over that is a large black coat that closes low on his chest, dragging down to the floor hiding his legs and feet.
On top of all that, his voice is deep and silky. His tone is even and calming like he has it all figured out and everything will be okay.
Solid 8/10 in your opinion. You can see where Sans and Papyrus get their good looks from considering Gaster made them.
“Before we go any further,” Gaster clears his throat, “can you understand me just fine?”
“Oh, yeah,” You tilt your head, “How–How are you doing that?”
“I’ll answer your question another day when you are not about to shout profanities at me for the most minor of inconveniences.” He says with amusement.
…Okay, fine. You guess that’s fair considering what happened not even two minutes ago.
“Yes, I can understand you even though you’re speaking in Wing Dings. Using ASL is helping a lot, though.”
He chuckles at this, “How did you know to use sign language, if I may ask?”
You scrunch up your nose, “I remember the River Person mentioning a man who speaks in hands. Honestly, it was just a shot in the dark if sign language is what they meant.”
“Ah, I see. That’s right, isn’t it? You are aware this is a game,” Gaster smiles ominously. “That Undertale is a game.”
“…”
“…”
“…”
“…”
“Yeah, but…” You frown comically, “I’d rather not think too hard about it if that’s okay. Or what it means for me. Or what it means if it is a game, how I can possibly be here in the first place. Or what it means that this is all a game, how can I possibly be in different Au’s-”
“-Sorry, sorry. No need to spiral so casually. Let’s move on from that topic,” Gaster clears his throat again. You wonder if speaking might be too much for him. “That aside, how are you, [Y/n]? I know this must have been a long, tiring day for you.”
“Uh, yeahhh. I can’t lie, it’s been hella overwhelming.” You want to rub your cheek, but stop yourself since you are still signing as you speak, “I’m trying to push it down the best I can and not make a big deal out of it. I mean, I literally fucking jumped into an Au! How am I expected to just keep calm and act like this is nothing?!”
You continue your ranting, your hand movements getting messy as you begin to pace, “Oh, but I gotta keep my shit together whether I like it or not! One moment of complacency, and this Swap-Papyrus is gonna Divine Skeleton Death Blast us to next Friday! For some fucking reason, everyone’s got beef with poor baby Sans! I already gotta be this picture-perfect version of myself, that is sooo tiring, you know?!”
Gaster, that beta cuck, starts to laugh at you!
Another hand is summoned by him, identical to the other two he already had out. The hand is used to poorly cover his mouth to muffle his laughter. He’s not even trying, but you guess it’s just for show to appear polite.
Yeah, you’ll take it.
“It can be rather bothersome at first, yes. Though, you will soon get used to it, and possibly tired with it, too.”
You want to cross your arms. You already know that you cannot.
You even out your voice so you don't sound irritated, “It’s great to officially meet you, really. But I have to ask again, why are you here?”
Another hand appears; now a pair of hands are used to sign, and the other pair is used to straighten out his coat.
“Do you mean as of right now, or is the question deeper than that?”
“You know I mean more than just right now.”
The skeleton sighs, “I’ll be happy to explain it another time, but now is not it.” Before you can ask why, Gaster speaks again, “You will wake up from this extremely tired because of our conversation. Your body is asleep, but your mind is not. The longer you’re awake in this way, the less rest you’re actually getting.”
UGHHH! FINEEE!
“Okay, okay.” You sulk your shoulders dramatically. “I know how to be patient.”
“Do you really?”
“…”
Gaster chuckles, “My apologies.”
“…You’re not sorry.”
“I am not.”
Fucker.
“Okay, okay. Let’s focus,” You wave your hands then remember immediately you’re not supposed to do that. Damn, you need to get used to speaking ASL as you talk. “Is there a reason why you showed up now of all times? Please just tell me.”
“You’re quite straightforward. I like that.”
Slay.
“If it’s all the same to you,” Gaster begins to explain, “I’d rather not give you the answer right away. If I wanted this journey to be simple for you and Sans, then it would’ve been simple from the start.”
You deadpan.
“Don’t you youngsters enjoy adventure?” He asks genuinely.
You drawl out your words, “I meannn, I guuuess. But if the moral of the story really is “friendship was the answer all along…”
You trail off, and for good reason. Despite his simple face, Gaster looks rather sheepish and nervous.
“No…” You slowly shake your head, “Ain’t no fucking way…
“Do you remember how you told Sans earlier that you believe being honest with that version of Papyrus had worked out better for you?”
Bro.
“Dude, no way. So you’re saying we actually need to befriend these people?” You narrow your eyes, hand movements getting, admittedly, lazy, “I knew I was having a weird feeling about that the whole time! That was you, wasn’t it? That feeling was intentional.”
Gaster’s extra hands begin to rub each other out of nervousness. “I want Sans to make friends…”
…
Dude…
You’re so fucking done. This guy is a fucking dork-enormous.
You guess it’s cute that even in these circumstances, Gaster is like an anxious dad wanting to make sure his emo son isn’t emo for life. You’re guessing that it’s not actually necessary. Rather, Gaster will offer more help once you meet these “requirements”, similar to how he made the DJ work only until after you were honest with Sans.
Gaster continues when your defeated expression doesn’t change. “That is not all, of course. Please, allow me to explain some more to give you more background.”
You sigh and gesture for him to keep talking.
Clearing his throat, he asks, “How much… In regards to my past and how I became this way, how much do you know?”
“Ehhh…” You twist your face trying to think, “I know more than the average person, I think. You created the Core, and… the DT Extractor?”
The corner of his mouth twitches upwards, “Yes, that’s correct. Is there anything else you know?”
“You… “fell into your creation.” You put a hand to your chin, “According to Sans, you also created him and Papyrus. I know that you’re–were the Royal Scientist, too.”
“Yes, you are correct.” Gaster sighs heavily, body language and tone becoming exhausted, “When I created the Core, I made it with more than one purpose in mind. The first and main reason behind it being to provide magical electricity to the entire Underground.”
“It does more than that, of course. Because of the ozone being a byproduct of electrical power–Well, you’ve seen it before, right? That wolf who throws ice into the water–the ice reaches the Core to cool it off. Since the ice melts once it gets close to the Core, the ozone fuses with it and it becomes a source of ozonated water. This spreads throughout the Underground, infused with its natural magic. Because of that, it can clean clothes, sanitize food, and purify drinking water. Really, the Core is almost perfect.”
Gaster stops talking abruptly, looking at you with an almost embarrassed smile. You were patiently listening to him ramble on, nodding along with interest. He realizes that you probably barely understood anything he just said. (You didn’t understand shit, but it was endearing to listen to him regardless.)
“A-Anyway,” Gaster coughs weakly, “I thought at the time if I could extract raw power from the Core, perhaps with that power I can begin a new experiment that would allow me to research ways to naturally break the barrier without human souls.”
“I did not get very far, as you are aware of. I made a miscalculation and fell in. I could explain to you why it happened the way it did, but to be frank I am not patient enough to explain it in a way you’ll be able to easily understand. Just know that it resulted in my body being torn apart and destroyed on the spot. My soul was all that was left, yet that too was scattered across space and time.”
You don’t really know what to say to that. What can you possibly say? What words could you possibly give that would give any sort of comfort to someone as tragic as him?
“I…” You gnaw at your bottom lip, signing meekly, “I’m sorry that happened to you. It’s not my fault, I know I don’t need to apologize. But–you know what I mean.”
Fucking nailed that shit (you’re going to die of embarrassment).
Gaster smiles appreciatively and with amusement.
“For now,” He goes on to say, “all you need to know is that, yes, I waited for you to tell Sans about your knowledge of myself, and your knowledge of the Resets and Saves and whatnot. I waited only until then to turn on that machine myself. I believe you and Sans are calling it the DJ?”
You grin, “Great naming, right?”
“Indeed it is. Though if I may be honest, Sans is very much capable of doing all of this on his own. He doesn’t necessarily need your help in going to the different Alternative Universes and timelines.” Gaster shakes his head, “But I quite enjoy that you’ve made friends with him, and you’ve lifted his spirits a lot. I know Sans, and I know his way of thinking. If I made it so that you are “necessary” to be involved, Sans would believe it is intentional and allow it to happen.”
Ah, you think you get it now. Gaster used Sans’ belief that nothing (especially things involving Gaster) is a coincidence to make sure that Sans would keep you around for this adventure Gaster is putting you through. You think it’s really sweet, in a way. That even though you’re here to do something for the scientist, it’s ultimately for the betterment of his son as well.
…You wonder if you should mention to him that you’re… super friendly with Sans. Now probably isn’t the best time…
“You know, you weren’t far off the mark with that. Sans already thinks that you’re doing all this in this specific way on purpose,” You tell the monster, “It’s nice you’re looking out for him still.”
“And that is why I would ask you to keep this part a secret. If he knew that he doesn’t need to bring you along for future outings, I fear he would leave you behind.”
You nod, “I’m not a fan of lying, but… I guess I can make an exception for this. And… Yeah, okay. Despite all my bitching from earlier, I do like the adventure.”
Internally, Gaster is fucking stoked. So he was right! The youth does yearn for adventuring! That means he’s totally still hip with the kids!
“So, back on track!” Gaster claps his extra hands together, “I have been scattered across space and time, including the Alternative Universes and timelines. The original piece of me is still in our original universe, of course. But aside from that, the largest scattered piece of me is right here in… What did you call it before? Underswap?”
“Ahhh!” You nod eagerly in realization, “So that’s why you wanted us to come here first!”
“Yes, exactly!”
“And, that also means there are definitely other Au’s after this one that you want us to visit for the same reason! We’re finding these pieces of you and we’re putting you back together?”
Look at you, you smart fucking cookie!
“Right, again. What you did today, the way you will eventually find this piece of me, this is what you will need to do as well in the other Alternate Universes.”
Gaster uses one free hand to rub his chin in thought, the other hanging in the air, “Admittedly, the location of each piece will be different each time. Moreover, the effect of my fragments will have different effects as well. This one just so happened to cause a disturbance in the magic that affects the monster's emotional and cognitive health. Unfortunately, this is something I genuinely have no control over.”
You cross your arms and look down, “How do we even find your fragment? I mean, what does it even look like?”
“All of my fragments will look vaguely soul-like. I believe you will know what it is once you find it. As to where and how to find it exactly, not even I am 100% certain.” Gaster grins teasingly, “Well, no. That is a lie. But I’m confident you will be able to find it yourselves.”
You deadpan. Again.
This motherfucker.
Are you supposed to love or hate this guy? Or both?
“Now that you’re informed of all this, I will allow Sans’ device to work again. I believe that will also be what helps locate my fragment.”
“Wai-wai-wait. You made it stop working on purpose… just because you wanted to prolong our stay… just so you could talk to me tonight and tell me all of this? Just so I can make sure Sans makes friends before we finish the job?”
“Yes.”
…
DUDE.
You don’t even know what to say. What do you even say to that? How should you feel about this shit?
You groan and hide your face in your hands, “Why can’t bitches just tell me the answer? Why do people gotta make things harder and make us solve puzzles and shit?”
Gaster hides his mouth behind his hand, hunching his shoulders in a silent, mocking laugh.
Brother really said teehee.
Is this where Papyrus got his love for japes and puzzles and crap? Both he and Sans are rather cheeky, too. Motherfucker really is their dad.
You roll your eyes. You realized just now that you stopped using sign language a while ago. You feel guilty and hastily move your hands again before asking your next question.
“You know I have to tell Sans all of this–most of this when I wake up, right?” You frown, “I did promise him that I would whenever you are involved.”
“Yes, I know. I did this with that in mind, after all.” Gaster then smirks smugly. Somehow. “Tell Sans I said hello, yes? And congratulations on the relationship.”
“…”
“…”
“…Okay, I will.” You say casually, “Wait! Wh-What about the Swaps? I mean, if they know why we’re here and how we got here… Sans was saying how they might make him fix their machine, too.”
“I don’t think so,” He says quickly and confidently, “Once the Swap-Papyrus realizes exactly what is going on, I have a strong suspicion that he will most likely be eager to have you leave as soon as possible. In terms of the timeline, this is way before your swap version would “canonically” show up. During this time, if we were to mirror our Sans, this Swap-Papyrus will be too nihilistic and pessimistic to want anything to do with these things.”
Gawdamn, bro is roasting Sans and Swap-Papyrus in one go. This Sans slander must be stopped.
“Oh? So, there is time travel technically involved in all this?” You ask worriedly. “Is-Is that safe?”
“…”
“…”
“???”
“Ehh, you worry too much.”
You’re going to cry. This is karma for cussing him out, isn’t it?
“If I am being honest with you, it is not wise. But, it certainly won’t be harmful to you,” Gaster waves a dismissive hand, carrying the attitude of a confident scientist who isn’t aware his hubris will be the death of him. “Unless I suddenly and explicitly tell you otherwise, you shouldn’t worry.”
Wait a damn fucking minute!
“Don’t–Wait!” You frantically wave your hands, “Doesn’t this mean we might possibly visit an Au where I’m already there?!”
Gaster fucking giggles at you! He fucking giggles! What the fuck!!
“Until next time, [Y/n].”
Then there is nothing.
…
…
…
There is nothing until you wake up in total exhaustion.
You are immediately aware of what you were dreaming about, and remember the conversation you had with clear memory.
Sans is still sleeping on you comfortably, but you are now awake filled with annoyance.
A quiet “Motherfucker…” tumbles out of your sleepy lips.
Why is everyone in the skeleton family such a tease…
Tags:
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#fanfiction#reader insert#female reader#don't forget fanfiction#sans x reader#undertale#sans undertale#sans#swap sans#swap papyrus#swap au#underswap#gaster#wd gaster
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Don't Forget
[Sans x Female!Reader]
43: Undertale? More like… Yappingtale (Got 'Em)
♪────✿(✧◕ᴗ◕✧)✿────♪
You coo at Childe, your new ginger cat, waving a toy in the air to play with him. Childe was jumping for the toy like a crackhead, but that’s just typical orange cat behavior.
It’s a nice Tuesday morning, chilling in the workshop with the two cats and your bone-friend. You’re sitting on your bean bag while Sans was doing something on the DJ machine. Today is the day you and Sans agreed to talk about all that’s happened lately.
You were responsible and made a small list to remember what you need to talk about. You don’t want to forget and complicate things later on.
Also, you totally named the black cat Morax because you’re fucking hilarious like that. You thought of Zhongli instead, but Morax was a little less cringey for a cat.
The skele-bros didn’t get it, but they agreed since their suggestions were met with hisses.
You are the ultimate pussy magnet.
Sans sighs and moves away from the DJ machine. The other bean bag chair is across from yours but is currently occupied by a sleeping Morax.
Sans looks at you, “[y/n].”
“Yeesss?”
“your cat stole my seat.”
“Hmm?” You look up, “Awe, but he looks so peaceful! Childe.”
Childe perks in attention, watching attentively of the toy you’re setting down.
“Childe, go play with Morax.”
Childe slow blinks at you, “wahh.”
So true.
You don’t know if it’s because he got bored with you no longer playing, or because he actually understood you, but the orange cat moves to the other bean bag.
He watches Morax intensely, lowering himself down and wiggling his butt. Oh, dang he’s getting ready to pounce!
Childe jumps elegantly onto Morax, waking him up from his peaceful nap. Morax’s ears go into airplane mode, meowing angrily at the other. He chases the orange cat off the chair, chasing him around the lab.
They’re not hissing or using claws though, so it must be another form of their playing.
Sans sits down, scooting closer to you, “they must’ve been friends for a long time, huh?”
“Righhht. Friends…” You recognize their behavior towards each other in downtime, and it’s not as casual as you first thought, “Historians will definitely call them best friends.”
Sans snorts, “what does that even mean?”
You shake your head, pulling out the torn paper from your pocket, “Nothing, nothing. I’m glad we didn’t separate them.”
“what you got there?”
“Oh, I made a list of things I needed to talk to you about. I figured we might as well use today to get it over with.”
Things to Talk About (in order of importance)
-Toriel Visit -Swap-Paps’ gifts -Really tired after using the mini-dj -Cameras around the Underground -Gaster said hello the other day -Also Gaster is on my soul (teehee?)
It’s… a lengthy list, but the first three shouldn’t take too long to go over. This is going to stress the hell out of poor Sans.
…Oh, well. RIP Bozo, part of your job is to stress out your mans. That’s why only Kōrenki could handle you before, now you can add Sans to the roster. Let’s fucking go!
“how responsible of you,” Sans crosses his arms and leans into the bag, “alright, i’m ready. what’s first?”
“I told Toriel I’d visit her for a week, remember? Since we’re back early, I might as well go tomorrow. I miss her a lot, and I wanna see her.”
Sans throws his head back, “ah, that’s right. uh, i mean… we just finished unpacking yesterday, but we can get your stuff ready later. still want me to drop you off there?”
You smile, “Yeah, I’d like that. And… maybe it’s time to meet Toriel?”
“um… yeah. i think so.” Sans blushes and looks at the cats, “please don’t take this the wrong way, but… maybe we keep our relationship a secret from her?”
You feel your face heat up. “Yeahhh, she’s like a mom to me, and I was never the type to tell my parents about my love life. How do you feel about it, though? Weren’t you two close?”
His blush dies at the question. He forgot you know more about this stuff because you’re like him. Still… His feelings for Toriel haven’t been romantic in nature for a while. As for how she feels about him… He isn’t sure he knows.
“Hey, it’s okay. You don’t gotta talk about it,” You sit up straighter, softening your voice, “To be blunt, it’s not really any of her business regardless. So, it’s best to just act like we’re only friends around her.”
Sans nods, grateful for your save, “yeah, thanks. it’s just not–i’m not-”
“-You don’t have to explain. This isn’t exactly easy to navigate. But you’re still meeting her, right?”
“yeah, i can at least do that,” The skeleton sighs deeply, “okay, next on the list?”
“Oh, right,” You look at your paper, “Oh, right!”
You dig out the box you’ve preemptively put in your pocket earlier. You present the orange box to the other, not reaching it further since you, admittedly, don’t want him reading the letter. It’s too private, and you don’t feel comfortable with him seeing it.
“oh, yeah. i saw that,” Sans leans forward, “but what’s in it?”
You hesitate, “It was–a gift from the other Papyrus. The other Sans drew me a little doodle, and Papyrus wrote me some DIY skin care products you can make with the glow stones.”
“he gave you something?” Sans’ grin falters, “i told you he liked you.”
You deadpan, “Dude.”
“sorry, sorry. so… he gave that to you before he left? when did he–was it when he gave you a hug?”
You cross your arms, not impressed with his tone.
He holds his hands up in surrender, “okay, i get it. so… what? what about it?”
“I was wondering if I could keep it here in the lab,” You point to one of the drawers, “I’m not planning on bringing souvenirs from every Au we visit, but it feels better if I keep it here.”
He shrugs, “sure, i don’t mind it. they’re all open so just put it where you want.”
“Thanks, baby boy!”
Sans blushes and rolls his eye-lights but says nothing else. Time for the next thing on the list.
“Uhm, so…”
Your eyes land on Childe and Morax. They’re napping now on top of each other, Morax's little mouth looks like it could be turned up in a smile.
You love cat.
“You may or may not have been right to be worried about me,” You wring your hands together and straighten your back. “I feel good now! But I did get really dizzy when we came back using the mini-DJ. And I napped for five fucking hours.”
“i’m glad you brought that up, actually. that was something i wanted to talk to you about,” Sans crosses his arms, furrowing his bone-brows, “it was fine using my shortcuts the first handful of times, but the stress of magic is slowly piling up on you. and then using the dj was a big heap of magic at once. the second time around wasn’t as bad because you experienced it before, but it was really close.”
“I was fine when you were using the shortcuts the other day, though. The day we came back.”
“that might be because compared to the dj, the magic usage for shortcuts is nothing.” Sans narrows his eye sockets, “i don’t get it though. the human kid never showed signs of being affected by my shortcut magic. logically speaking, as an adult who’s much stronger, you should be fine from it as well.”
Yeahhh…
‘IF ONLY. THERE WAS SOMEONE OUT THERE. WHO CAN TELL ME. WHAT THIS COULD POSSIBLY MEAN…!!’
…
‘GASTER.’
“Alright. Alright. Stop yelling.” The tired voice groans in your head, as if you woke him up, “What is it? You will have to repeat it for me.”
You purposely make a face like you’re thinking so Sans doesn’t think you’re hearing the Voices™ even though you literally are.
‘Sans and I are talking about why I’m being affected by magic lately. Specifically, the magic that comes from his shortcuts and the DJ. He said the human kid from before was never affected by it, so why am I different?’
“Oh, is that all?”
‘’Oh, Is ThAt AlL-’ Fuck you mean by that?’
“I was expecting Sans to-”
“uh, [y/n]? you okay?” Sans calls in concern.
“Shh, Sans,” You make a “calm down” motion with your hands, “I’m talking to the Voices™.”
He smiles sweetly, “oh, okay.”
“…”
“wait, what?”
“As I was saying,” Gaster continues without a care in the world, “I was expecting Sans to have figured it out already. Perhaps he has forgotten your origins already. You do behave as though this is originally your world, so I suppose I can cut him some slack.”
‘My origins? Does where I come from really matter?’
“Of course it does. It is also the explanation of why you are unable to Save or Reset despite your Soul.”
…
???
“Sorry,” Gaster clears his throat, “I paused for dramatic effect.”
…You outwardly sigh. Sans gives you another concerned look.
“As you should know, humans were known to have magic a long, long time ago. After all, it was the seven HUMAN mages that had summoned the barrier in the first place. Over time, the amount of humans who have magic dwindled significantly, but it never truly disappeared. Even now, humans cannot use magic, but it is still within their biology. Only slightly.”
You nod along to Gaster, listening intently to his tale.
Sans is worried for your mental health, but he’s not about to say anything. So what if you’re mentally ill? It just adds to the experience. Still, he’s getting a bit… bored.
Using his magic, he takes the cat toy that you had put down a while ago. He might as well entertain the kitties while he waits.
“That being said, you are not from this world. You are from a world without an ounce of magic. The reason why that child was unaffected by Sans’ shortcut magic, and why they can Save and Reset is because they have magic.”
“Though, it’s definitely not the same amount of magic or power that us monsters possess. But that very small, very minute amount is enough for these purposes.”
‘…So… I’m affected by it because I have no magic in me. But I am getting used to it.’
“Yes, that is correct.”
‘And you’re saying if I did have magic, I could’ve been able to Save and Reset?’
“Yes. After all, your Determination is much greater than anyone I’ve seen before. Even compared to that child.”
Huh… You don’t know what to do with that information. Is that why your Soul is gold? Because it’s just straight up Determination? Is that something you should unpack later?
“If that is all,” Gaster sighs in a tired (old man) manner, “I will be going now.”
‘Oh, okay. Thank you, by the way.’
… Nothing. He was gone as soon as he announced it.
Fucker.
Sans has been playing with Childe the whole time, Morax is still sleeping like an old man. You wonder how old these cats are, Childe is clearly the younger one with all that energy he has.
“Sans,” You beam, “I finished speaking to the Voices™.”
“…” Sans gives you a once over, “you’re talking about gaster, right?”
“How’d you know?”
“…” He sighs, “you freaked me out at first. i still can’t get over that you’re just–that you can just talk to him.”
You look at your list, “Funny you say that! That’s actually the last two things I wanted to mention! We’ll be skipping number four, though…”
“pfft. will you feel better if we put a pin in this to talk about number four?”
You nod.
“shoot. i can be patient.”
It is absolutely killing him inside, but he’ll do it for you.
“Remember how you were saying that we couldn’t risk monsters seeing me? Snowdin has been chill about it (“heh-heh, nice.”) but we can’t risk any more than that.”
“yeah, and i still think so.”
“Right. But… The cameras.”
“…the…” Sans blinks, “cameras…”
You nod, “The cameras.”
Sans drags his hands down his face, groaning and sinking deep in his bean bag.
Yeah, he definitely fucked up.
He is cooked.
You are cooked.
You are fucking cooked.
“So, anyway,” You crumble up the paper, “Back to Gaster!”
“we cannot just skip over that. i can’t believe i forgot about the damn cameras,” Sans whines, “they’ve been so useless to me before you came along, that i just completely forgot they were there.”
“I mean, I’ve been here for a few months and we haven’t gotten any surprise visits from Undyne or King Asgore.”
He shakes his head, “no, i still don’t like it. i’ll do something about it, don’t worry.”
Uhmm… You ain’t sure you like the sound of that…
“You’re not gonna, like… go ape shit, are you?”
“you’ve mistaken me for someone who has the energy to go that far,” Sans waves a dismissive hand.
“If you say so,” You shift on your bean bag, getting more comfortable, “But if I see you on the news, I’ll go out of my way to clear your name. Don’t worry, I gotchu.”
You’ll just ask about it when you get back. If Sans is serious about standing on business, he should be done with it by then.
“now that that's out of the way, we can finally talk about gaster.”
He closes his eyes for just a few seconds. When he opens them again, he snaps his fingers to summon–oh, it’s the soul-fragment.
It looks the same as ever to you, if there's a difference to it then you don’t notice it. You only saw it for a short time back in UnderSwap, and it’s been with Sans ever since.
“only you can see it, right?” Sans asks.
“Yeah,” You make an upside down heart with your thumbs and index fingers, “It’s like this, but it has hard edges to it instead. It’s white with a weird, purple-black aura glow around it.”
“you said you’d tell me why that is,” Sans’ smile becomes weaker, “i think i can guess why, but i’d rather hear it from you.”
“I will, but you can’t freak out, okay? I only just found out on the day we came back, but I wanted to wait until now because I didn’t wanna stress you out.”
Sans simply nods, gesturing for you to keep talking.
You take a deep breath. “So… Gaster is kind of… with me…”
Sans snorts, “yeah. i figured since you were just talking to him in your head.”
“Right, but…”
“but…?”
“He’s not possessing my Soul or my body or anything, but he’s just kinda…” You scrunch up your face, shoulders hunching up and you force yourself to say it. “He’s like, on my Soul? He’s just riding along and chilling.”
Sans blinks and suddenly his left eye is glowing the same yellow and cyan. His eye frantically searches around your body, though staying in the general area of your chest where your soul would be. You don’t feel like he’s peeping at your soul, but his intense gaze makes you fidget nonetheless.
The skeleton monster sighs and closes his eyes, “i can only sense your soul, nothing else…”
So that’s what he was looking for.
“Gaster did tell me that it was just a really small piece of him, so maybe that’s why you can’t see him or sense him? You couldn’t use your Blue magic thingy on the fragment before because it wasn’t tangible enough, remember?”
“yeah, i know. i was just… hoping.” Sans sits up again and looks at you. his eye-sockets back to normal, “i gotta be honest with you, [y/n]. i don’t like the idea of gaster free-riding in your head like that. you don’t feel dread or scared?”
You are NOT correcting him on that. You think he might lose it even further if you tell him what you mean.
You shake your head, “The only reason I had a chance to capture Temmie was because Gaster was helping me. Seeing the fragment, knowing where exactly it was, how Temmie was using it, and everything I know about it was because of Gaster.”
You continue, “I spoke to him again the day we came back, but it was only him explaining all this to me. He’s still here with me, but at the same time, I can’t really feel him anymore.”
Which is true. You know it in your heart and soul that Gaster is still lingering, but you get the sneaking suspicion that he’s not going to answer you if you try calling out to him again. He sounded really exhausted earlier, it must’ve taken a lot just to tell you that little information.
Gaster said he was stronger because the fragment is back in this Universe, but it’s clearly not as much as you thought originally. Not as much as he originally thought, either.
You suppose you’ll dream about him again if he really needs to talk to you.
“i gotta think about all this…” Sans mutters.
“Of course, take your time.”
That’s why you two chose a day to talk about all this, after all. Thinking it over is part of that process.
In the meantime, you start to play with Childe again. He’s such a crackhead, you love him. Morax also moved to sleep closer to you and Sans. He was in that mid-car crash position, but that’s how you know he’s sleeping good. You wish you could sleep like a cat.
Oh, to be a liquid.
Sans’ quiet sigh brings your attention back to him. Childe meows at you when you stop looking at him, but he quickly gets over it to bother Morax instead.
“okay… i don’t like it, [y/n]. i really don’t. i don’t know what he’s thinking, but…” Sans leans forward, his smile almost gone, “you have to promise me you’re not feeling in danger.”
You smile with as much reassurance as you could muster, “I promise, Sans.”
“and you have to promise me that you’ll tell me if you think you are.”
“I promise, Sans.”
Sans nods, backing away just a bit, “i hate making promises, [y/n]. but if you can keep those promises to me, then i promise you that i’ll take care of it the moment you need me to. no matter what.”
Making promises to him though, with someone like Sans, it feels heavy.
You know what promises mean to him, and how much they’re worth to him. It, admittedly, has your face heating up. He made you promise him something, and in return he made you a promise, too.
Shit has your heart aflutter, Goddamn.
“I understand, Sans. I’ll keep those promises to you. Right now, I really do feel fine.” You reassure him again.
There is a very small tinge of pink on his cheek bones. His smile widens yet softens, leaning back in the bean bag. He looks over to the DJ machine and gestures to it lazily.
“smoothly onto other things,” Sans winces, “the dj. it’s–kind of out of commission.”
You smile nervously, “What, like it’s broken?”
“no, no. nothing like that. only that it might take a month or so to work again.”
“How come?” You laugh, “Is Gaster being a little shit again?”
“nah, he’s chillin’, but it’s a matter of magic. the amount of magic energy it needs to make these jumps are insane. maybe in three to four weeks, it’ll have enough magic energy to work again, and we’ll be on our way to the next au or at.”
“On that topic, do you know what the next Au will be?”
“hm, no. it doesn’t work like that. maybe in the final week, like how it was last time.”
“Okay, so from a month from now. I’ll be better prepared to call off work this time, haha!”
Is it corny if Sans finds genuine happiness from your laughter? Maybe. He should probably keep that to himself.
“more alternate universes and alternate timeline’s mean more fragments. more fragments mean i gotta find a better place to store these things,” Sans looks in the general direction of Gaster’s fragment.
“i think i know what to do with this one for now, but eventually i will need to make a chamber that will be enough to stabilize the fragments when they’re together. you’ve written it down in that little notebook of yours, right? a monster is almost all magic, but that magic can be pretty fickle and fragile in vulnerable moments like this.”
You nod, “Mhm, mhm. Like in those science movies where the test subjects are in those big tubes with weird liquid in them!”
“pfft!”
“…”
“…oh, no you’re serious.”
“What do you mean ‘oh no’!?”
“i mean, yes and no. visually, yes, you can think of it like that. but the functionality is different, and the same logic applies to those movies.”
Sans looks off into space as he yapps, “in this case, it’s less that we’re growing and nurturing something, but rather we’re keeping something maintained and preserved. something to gather the surrounding particles too so that every little speck of gaster will be brought back. it’s going to be a stabilizer, to hold the fragments and keep it together. when gaster gets stronger to materialize himself more and more-”
The Comic falters and chuckles. You look a bit lost and he was already trying to go out of his way not to use big words.
“sorry, nerd stuff. t-l-d-r, it’s like those science movies.”
You pout, feeling a little dumb that you can’t keep up. You shouldn’t feel bad though, this is not your area of expertise, it’s Sans’.
“I don’t know shit about any of this stuff, but if you think we need it, then I think so too,” You hold up a thumbs up, smiling meekly, “I wish I could help you, but, you know.”
He shakes his head and waves a dismissive hand, “don’t worry ‘bout it, babe. this is where i get to shine and be the star for once.”
“That’s true, I really admire this side of you. I’ve always liked a man with a big…”
“…”
“…”
Sans blushes.
“Sense of intellect.”
“that felt kind of flat.”
“I was gonna say brain but you’ve got a hollow skull.”
He laughs, so kudos to you. Look at you with your hella rizz.
“Anywayyy,” You look at the fragment, “What did you wanna do with it?”
“hm, a simple container will be fine for now, but i don’t have anything like that here…”
“…Dr. Alphys should have some in the True Lab, right?”
He narrows his eyes, “how do you…” Oh… OH! “oh, right. you know. uh, yeah. i guess she does, huh?” Sans stands up with some struggle, “i’ll be back, then.”
You snort, “You’re just gonna steal it?”
“well, yeah. that place doesn’t have cameras so i’ll be fine. just an in n’ out mission. i’ll only take one so she doesn’t notice a thing.”
“Be safe, bone boy.”
Sans winks at you while offering a solute. Next moment, he blinks out of existence, the soul-fragment left behind. It’s a jarring experience to see that from an outside perspective-
“MRAH!!”
Childe jumps up on all fours, tail puffy with airplane ears as he stares where Sans just was. Morax was still lying down, but he was also looking where Sans used to be.
You start snickering when Childe does that little scaredy cat shimmy, his back all arched while walking on his little toe beans.
Bro is skimpering and skittering. You love cats.
“Pspspsp,” You tap your fingers together, “C’mere Childe, c’mereee! Pspsps!”
“wahh.”
Childe starts hopping towards you, his body language relaxing but now he’s in a very playful mood.
Oh, here he comes! Here comes the boy!
Giggling like a little bitch, you start waving your hands at the cat, playing with him because he’s just a baby.
“We should cut your nails, baby,” You mention to Childe.
But Childe does not respond, because Childe is a cat.
Shame.
There’s a strange static in the air, then BOOM! In an anticlimactic fashion, Sans appears again in the workshop with something in his hands.
He looks kind of frantic and–is he sweating? What the hell happened?
“Are you okay?” You stand up to get close to him, “You were only gone for less than a minute.”
“yeah, yeah. i uh, i…” Sans holds up the container, “got the thing.”
“Sans, what happened?”
“you remember those uh… those experiments alphys did?”
Ooh…
“You ran into one?” You grimace.
“shortcut right in front of it.”
“…That’s a lil’ funny.”
“jumped right out of my fucking bones. nearly scared me half to death.”
“You okay, though?”
“yeah, yeah. i’m good.” Sans looks at the glass in his hands, “alphys had a lot of empty ones, i really doubt she’ll notice it’s gone.”
It’s the same glass vase you’ve seen many times before. The one used to keep the human souls inside.
The human souls of children.
Seeing it slaps you with guilt. You should find time to go to Waterfalls to find the Dusty Tutu and Ballerina Shoes.
“How do you feel about this?” You take the jar from him, “This is all to bring Gaster back, but how do you feel?”
Sans doesn’t answer you at first. Instead he uses magic to blindly grab the fragment he left behind. He pulls the fragment towards you two, bringing it close so you can put it in the container.
“i don’t know,” Sans whispers finally, “no… that’s not true. i’m confused, but… i feel nervous? happy? doubtful… hesitant. excited. i’m feeling a lot of things,” He shakes his head, “this changes a lot, y’know? and what am i gonna tell paps?”
“Maybeee we should tell him? Let him know what we’re actually doing going to all these Au’s.”
“yeah… better late than never… but…”
You don’t want to overstep here. Papyrus is your little pookie, but he’s still Sans’ brother first. Whatever else happens, you don’t have a right to interfere.
If Sans wants to wait a little longer to tell his brother, there’s nothing you can do but respect his wishes.
You know if the roles were reversed, you wouldn’t appreciate Sans telling your siblings something you weren’t ready to share yet. The difference is that Papyrus is a grown man, but the principle still stands.
Sans helps you with putting the fragment into the container. You don’t feel any different now that it’s confined, so that means Gaster isn’t closed off from you. You didn’t think it would work that way, but you can’t be too careful about these things
You move it and put it on the counter where the rolled up blueprint is at.
Since you’re here, you might as well find a drawer to put your box in. Maybe you can put your notebook in here too, the one you use to write your observations and learn about the monsters.
“So,” Biting the inside of your cheek, you think how you should word this. “When we got to UnderSwap, it didn’t look out of the ordinary at first. But then Gaster confirmed that we showed up during a time where I haven’t shown up yet. But he more or less confirmed that the UnderSwap version of me will show up there eventually.”
You turn around and lean on the counter, “We didn’t think time travel was involved, but it very much is. One day, we might show up in an Au when I’m already there.”
Sans groans, hiding his face, “i can’t believe the old man told you–is telling us not to worry about it. then again,” Sans rubs the side of his cheek, “that papyrus said he doesn’t remember resets, so maybe that’s why. because there isn’t a real risk to seeing you when it’ll all be reset anyway…”
“How come you’re the only one who remembers? Are you the only one who remembers?”
He shrugs his shoulders, sitting down on your bean bag since that was closer.
“i dunno. i didn’t always remember. but somewhere along the line, i was starting to. i stopped questioning how since in the end, it doesn’t matter why. the fact is, i can remember resets, nothing can change that now.”
Well, you suppose that’s true. But what if only a “Sans” can remember? Swap-Papyrus couldn’t remember even though he has the Sans role and personality, but you never once considered if Swap-Sans could remember.
You doubt it, but it’s not like you asked him, and he never hinted if that were the case, either.
Anyway, this only raises a very important question.
“Sooo…” You clasp your hands together in front of yourself, “If we meet another me, are you gonna smooch her?”
“what!?”
“Well, ‘cause if you like me in every Universe, I am 100% positive that if I also liked you in every Universe, too.”
Sans waves it off, “maybe, but you’re the only human i want. just like how you said i’m the only bone boy you want… right?”
You smile softly, “That’s true. It’s just you, Sans.”
Sans blushes, but that’s to be expected by now, “same here.”
“…I wouldn’t be mad if you wanted to smooch another me, though,” You continue casually, “Like, as long as I can watch. I’m not vanilla, in case you didn’t notice.”
His face explodes in red, “what?! you���are you say–why would you-”
“-Oh, my God.” You throw your hands up and roll your eyes, “I’m sorry. Never mind, Mr. Vanilla.”
Sans sinks into the bean bag, his jacket bunching up to hide the lower half of his face. You let the silence fall, not genuinely bothered by his reaction.
You know Sans gets flustered when you come on strong, you were only teasing him.
You end up putting your boxed gift in the very last drawer since that one was empty.
The others were filled with the photo album, a badge, and crumbled blueprints.
The badge was pretty interesting, actually. The front held the symbol of the Delta Rune with:
SANS
Research Assistant
When you flip it over to the back, you see a fine-print. “Royal Scientist 🕈︎👎︎ ☝���♋︎⬧︎⧫︎♏︎❒︎’s Personal Research Assistant.”
You could ask Sans about the WingDings, but you don’t need to. Ever since that dream, you’ve been able to understand WingDings. It appears that you’re capable of reading it, too. Does that mean you could write it?
Hm, something to test out later.
The photo album peaks your interest, too. You refuse to look through it without permission, and you can tell now isn’t the best time to ask about it.
The crumpled blueprints look all similar and somehow glitchy. They must belong to Gaster, but it’s incomprehensible despite your understanding of WingDings.
“um… [y/n].”
After two minutes, Sans is ready to talk again.
You close all the drawers and turn around, giving him your full attention. He’s not looking at you, but that’s okay. There’s a strong blush on his face still, he looks so cute.
“i’m not… i’m not really interested in that stuff,” Sans admits weakly, “‘m not saying it’s completely off the table, by the way. just that before, i never had a desire for it. and when i did use to–when i used to like someone that way in the past, i never felt the need for it either.”
Ohh, that’s why he went all quiet. Sans was trying to think of a way to gently let you down. From how he’s phrasing it though, he made it sound like you shouldn’t give up hope.
With genuine curiosity, you ask, “And now?”
Sans gives you an obvious once over then looks away. His blush only grows.
“i don’t think i’m ready for that any time soon, but… you know… i wouldn’t have had such a strong reaction from just your kisses if it was a turn-off for me.”
‘FUCKING SCORE!!’
Look, as much as a degenerate you are, sex truly isn’t everything for you when it comes to a relationship. You have no problem if you two are never intimate, and if it becomes an issue later down the line, that’s something to work out later. But now, there is no need.
You won’t dare rush Sans or make him feel like he owes you anything, you are fine with what you have now.
“We don’t gotta worry about that, Sans,” You say earnestly, “For now, kissing is still fine?”
Sans nods, relieved to the bone. It seems he didn’t have to worry so much, of course he didn’t. You never gave him reason before to think you’d blow up in his face about something, so it wouldn’t be different this time.
You bend over and start petting the ginger cat. “What about you Childe? Are you and Morax date-mates?”
Childe only meows at you and gives your murder mittens. His nails are long, but he’s not during it to hurt you. In fact, he might be trying to get you to play with him. AGAIN.
Jeez, this cat has a lot of energy…
Sans snorts, “those cats only like you, by the way.”
“No way.”
“yes way. morax was sleeping on my ribs and kept putting his little face against my nose. i think he was trying to suffocate me.”
“Aww, he likes you!”
“no way.”
“Yes way! Trust. If a cat really hates you, they let you know.”
Sans side eyes Childe, who is now letting you pet his tummy.
You’re playing a dangerous game doing that. Sans has little to no experience with cats, but even he knows not to pet a cat's stomach.
That’s proof right there! Literally proof that you’re the fucking favorite! Sans can’t blame them cats either, but still.
Shit is brutal out here for a skeleton.
Tags:
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#fanfiction#reader insert#female reader#don't forget fanfiction#sans x reader#undertale#sans undertale#sans#wd gaster#gaster
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It lives.
we’ve got a sad one, bois.
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Merry Christmas
Since it's been literally 2 years, I'm going through and cleaning up some mistakes in One Taste, then posting the next chapter.
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Chapter 13 is up!
#gaster x reader#gasterxreader#gaster x you#wd gaster#fanfic#ao3#undertale#reader insert#slow burn#in the name of science#ITNOS#dimetrodon
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Chapter 12!
#gaster x reader#gasterxreader#gaster x you#wd gaster#reader insert#undertale#slow burn#fanfic#ao3#in the name of science#ITNOS#dimetrodon
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