#but the fact that he always had that kinda flared ribcage and thick neck tell me that this man always had the dilf in him

[crusnikroxas]

La Première (18+)

**Author Note**

Bara Undertale Sans x Reader

Word count: 4432

This is last part of the first prize from the raffle for the lovely @malenchka! :3 She requested ‘your first time with a touch sensitive Sans’ ;p Oh yeah. And he’s a biiiiig guy. >.>

I’m sorry if this isn’t as, uh, excessively long as usual (not like Sans’ di-); I’m a bit under the weather, so my brain is kind of dead T-T

**End Note**

“ah, sorry sweetheart, i’m kinda busy today.’

“i’ll be working late again tonight, sorry.”

“i just can’t today, m’sorry.”

“...sorry, y/n.”

Your interactions with your boyfriend Sans had been going on like this for around three weeks now. Excuse after excuse – the only interactions with him you’d had were over the phone.

And the worst thing was that you knew exactly why.

The last time you’d seen him you’d been hanging out on the couch like always, just chilling and screaming at a particularly stupid movie on Netflix. You’d sneakily attempted to move a little closer than usual, hoping for a snuggle session; something which Sans had always seemed edgy about, but you just had a desperation to be closer….

...before you accidentally touched his neck.

You hadn’t meant to – the top of your head had simply trailed across it as you were struggling to get yourself properly situated; you should have guessed that it wouldn’t be an easy feat, given his size.

But that small touch was all it took – before you knew it, you’d been promptly shoved to the side, and Sans had quickly retreated, spouting some bullshit about suddenly being exhausted, leaving you alone on the couch, completely nonplussed.

And now, you were fed up.

If he was worried about how you’d feel about him finding you….disgusting, well, sure, you were going to feel like utter crap, but at least you’d know. Anything was better than this obvious evasion bullcrap of his.

So you hatched a devious plan – a plan which his brother had helped you with, naturally (Papyrus had freaked out pretty bad after not seeing you for a week – but was endlessly thankful to find out you didn’t hate him). He’d hidden you at their house until he was completely sure that Sans was around (yes, you’d sat yourself in a cupboard for a solid 4 hours, you weren’t exactly proud of it, but desperate times called for desperate measures); before leaving to go to Undyne’s for the weekend, texting you as he left (GOOD LUCK, TINY HUMAN! I BELIEVE IN YOU!)

The trap was set. Now all you had to do was complete it, and not fuck up.

Slowly you slunk out of your kitchen cupboard prison, quietly stretching your arching limbs and sighing in relief when you heard that the TV was on – that meant he probably wouldn’t hear your approach, an integral part to the plan; you didn’t want him teleporting off somewhere, so you needed to make sure you had some kind of hold on him. That way, he wouldn’t be able to simply disappear without carrying you along.

Gathering your grit, you sneaked your way across the carpet to the living room, keeping as low as you could, just in case he saw your reflection in the TV screen. Soon, you were safely behind the couch, an oblivious Sans giggling at something on the TV above you.

Before he could so much as catch his breath after his laughter, you leapt up from your hiding place, hooking your arms around his neck as hard as you could, grasping onto your arms for added grip.

He gasped raggedly at the contact – and the next thing you knew, your body had started to float up off the ground; you growled under your breath, gripping harder to ensure continued contact, quite offended that he’d have the nerve to use magic on you.

“Stop it with the floating crap, Sans!”

You immediately drop back against the back of the couch as Sans continues to gasp in alarm, now realising who it was who had openly attacked him; you purposely squeezed a little tighter. If he was that disgusted by your touch, by god, you were going to make him suffer for it.

“Right. Now, here’s how it’s gonna go down-”

“stars, y/n, you scared the soul outta me!”

“Shhh! You’ve been ghosting me for three weeks, and now, you’re going to tell me why, and I’m not letting go until you do!”

Sans groans softly at that, before quickly standing up in an effort to catch you off guard and shake you off; which doesn’t work in the least, only making you hang on all the tighter as your kicking feet swing in the air.

“I told you, I’m not letting go! Now, sit the fuck back down and talk to me!”

He outright growled at that, but did as you asked, plonking himself back down on the couch with an irritated huff, giving you the opportunity to scramble over the back of the couch at last and wrap your body around his; something which you almost immediately regret when he shudders and tenses up under your touch.

“….do you hate me that much, Sans? Am I….that disgusting to you?”

You’re met with silence, before he heaves out a heavy sigh.

“...no, y/n, sweetheart, it’s not like that. shit, i should have realised that’s what you’d think...”

“...well, do you just want to end this thing we have, then? Is that why you-”

“no! stars, no. i….ok, no good way to come out with this….but first, would you...can you l-let go of me?”

“….are you just going to run away if I do?”

“i promise you, sweetheart, i won’t.”

You grumble slightly, but finally allow yourself to let go – Sans was always a man of his word. Slowly you clamber off his back, landing with a soft ‘oof’ next to him on the couch; he meanwhile seems to sigh with relief, making your metaphorical hackles raise in response.

“So. Explain. Because you seem pretty damn pleased that I’m not touching you right now.”

He squirmed in his seat, painful guilt spreading across his features.

“i don’t...hate you. or find you disgusting….heh, quite the opposite, in fact. but….oh man, this is gonna sound so stupid. i’ve never….i’ve never been with a human before. you’re just so...so tiny, and it’s been so long since someone’s hugged me like that, and i just don’t know how to deal with it-”

“Wait. So what you’re saying is….that you’re basically touch-starved? And worried that you’re going to hurt me?”

He hurriedly nods, gulping, eye-lights flickering down to examine the carpet.

“pretty stupid, right?”

“...no, not at all. I mean….I get it, if that’s what you’re worried about. But Sans...Sans, look at me.”

He does, his expression desperate, obviously expecting the worst; carefully, keeping eye-contact with him all the while, you climb up and into his lap, before slowly reaching up and cupping his face – he shudders delicately under your touch, his expression growing increasingly anxious.

“Hey, it’s ok. You’re safe….just relax into it, ok? It’s ok to just….enjoy it. I’m not going anywhere.”

His sockets widen slightly at your words, before he heaves out a heavy sigh, taking a moment to adjust, smile stretching a little wider as you gently rubbed at his cheeks with your thumbs.

“See? I’m not breaking or anything.”

“…but i’m not touching you.”

“You can, if you like.”

He hesitates for a brief second, before reaching up and placing his hands on your waist; now it was your turn to shudder slightly under his touch – the sensation of his enormous hands squeezing the flesh of your stomach was utterly delicious.

“am i hurting you?”

“Oh no, far from it. I was just thinking...how nice it feels.”

The corners of his smile lift at that, his movements on your waist growing a little more confident, phalanges prodding and stroking at the flesh curiously; how you ached to have those hands under your shirt.

Edging your body just a touch closer, you tip your head up and confidently kiss him; for a moment, his body freezes up, before he moans, deep and low, opening his mouth and licking your lips – a heated shiver runs up and down your spine as you open your mouth, lapping at his tongue as best you could, inwardly day-dreaming about how amazing such a tongue would feel just a little lower.

Eventually, you’re the one to break the kiss, smiling up at him reassuringly as he exhaled as if he’d been running a race, chest heaving, a spattering of blush across his cheekbones. It was a good thing; it told you that he was enjoying what you were doing. There wasn’t a hint of revulsion in his expression, only a sweet, worried hesitance.  

Slowly, you trailed your hands down to his neck; his breathing hitches, a soft moan escaping him, his sockets fluttering shut – you grin in response, continuing to trail your fingers ever so softly over his vertebrae.

“Is that….nice?”

He shivers at your slightly lowered tone, frantically nodding.

“y-yeah. sweetheart, are you sure-”

“You’re not hurting me, not even a little. In fact...”

Your hands leave his neck briefly, resulting in a gentle whine of complaint from him; which quickly changes to a choked inhale, his sockets shooting open in shock as you lift up your shirt, slowly dragging his hands up to your ribcage.

“...I think you can touch me more. I want you to.”

“i...i...”

His eye-lights shake and dilate in his sockets, his phalanges warily grazing against your flesh, feeling the bones beneath.

“...y/n...you’re so...tiny.”

“Pfft. Maybe by monster standards.”

“heh, i mean, your ribcage is just...”

You chuckled, hands drifting to his chest, fingers trailing over the bones beneath his shirt.

“Well, compared to yours, I suppose you’re right.”

He’d gone completely still at your gentle, stroking touch, sockets wide, before a nervous, shaking laugh escapes him.

“heh, y/n, t-that’s kind of a s-sensitive-”

He gasps, his back arching as you experimentally dig your fingernails into what bones you could reach through his shirt.

“h-holy shit-”

“Too much?”

A shuddering, more than pleased moan is all you receive; grinning a little wider, you quickly flip up his shirt, fingers seeking his ribs – you blink in shocked surprise as you realise he really wasn’t kidding about you being ‘tiny’; you just about manage to grab a hold of one of his floating ribs, your hand barely closing around the thick bone.

Sans’ socket flared with magic, a mewl erupting from him as you stroked the slightly rough texture of his floating rib. Feeling ever more confident, you lean your body forward, licking the side of his neck, grinding your hips into him; his hands tightened deliciously on your body, thumbs rubbing the undersides of your breasts as his movements became evermore desperate.

“y-y-y/n-!”

You hummed softly in answer, stopping for a moment in your ministrations to look up at him teasingly.

“You ok?”

“m-mm...”

“Want me to keep….going? Or is this too fast?”

He ground his teeth as he thought it over, eye-lights flickering as he read your expressions.

“i...sweetheart, i’d love to, but-”

“Oh, well, if you’d love to~”

You purposely scraped your fingernails along his rib; his mouth opens in a silent scream, phalanges digging down hard into your flesh subconsciously – you wondered if he realised how close his thumbs were to your breasts, as surely he must have noticed your squirming as you relished under the harder touch.

“n-no, wait!”

You immediately stop, not wanting to make him panic.

“What’s up?”

“i...i….i’m gonna be too big for...y-you.”

You raise a singular brow at that.

“You mean your dick?”

He flushed, socket widening at your brass statement.

“uh...yeah.”

“Huh. Well, can I be the judge of that? Bet you anything that you won’t be.”

He audibly gulped, before chuckling gently.

“...you really wanna do this on the couch?”

“Honestly, I’d be happy to do it anywhere if it involves you. But if you’re uncomfortable, we can move.”

His blush immediately increased at your words, embarrassed puffs of laughter escaping him.

“oh, stars, sweetheart – heh, you’re being kinda, uh….dominant, y’know? ‘kay, maybe that’s not the right word, but-”

“You’re nervous about this, right? So I don’t mind taking the lead just a little until you feel more confident about things. I just….I just want to make you feel good.”

More embarrassed laughter escapes him at that point, his gigantic body shaking underneath yours.

“So...want to go to your room?”

With a little more eagerness, he grabs onto your body harder; and before you knew it, you’d appeared in Sans’ admittedly filthy room. He’d managed to appear on his mattress though, thankfully (landing in a pile of dirty socks would have most definitely been a turn off).

Now that he was in a more ‘comfortable’ space, you wasted no time, quickly returning to your gentle touches, increasing the kisses and licks against his neck; he shivered and groaned loud, before pulling you off with apparent ease, hands tight on your hips as he held you away from his body. You frown, struggling lightly in his hold, not understanding his sudden refusal.

“h-hang on a second. i just….did you...”

He swallowed, eye-lights shifting away from you.

“did you wanna….get undressed with me? it’d probably make it...easier, right?”

You pause for a moment, absorbing his words, before grinning wide, happy that he was getting a little more confident with being intimate with you.

“Hell yes it would, big guy. So….wanna go first?”

“….how ‘bout we take turns?”

You shrug; you weren’t bothered either way – the sooner you got your mitts on him the better. He smirked slightly, obviously catching onto your hardly masked eagerness; before he started to peel off his t-shirt, keeping solid eye-contact with you all the while.

You bite at your lip as his full ribcage finally comes into view; it was one thing to feel it, but to actually see it in front of you? He truly was massive. You could understand why he thought of you as delicate and breakable, with bones as thick and hardy as his – his humerus was the size of your thigh, for fucks sake.

He watched your expression for any hint of hesitation; and seemed quite shocked to not only find no such thing, but to see the growing excitement on your features.

What could you say? You were a total size queen.

“Heh, guess that makes it my turn, right?”

Smirking ever so slightly, you shed yourself of your own t-shirt, confidence sky-rocketing when you hear a soft intake of breath coming from Sans, his eye-lights dilating at the sight of you. You’re a little put off, however, by his next words.

“...you’re so tiny.”

“Oh my god, would you stop? Yeah, you’re the monster with a teeny tiny human for a girlfriend, we get it.”

He audibly snorts, covering his mouth as his frame shakes with laughter; laughter which continued as he started to strip off his shorts, before carelessly throwing the material off into some corner of his room (probably never to be seen again). You feel some disappointment that he’s wearing boxers under his shorts (he’d always struck you as the type to be too lazy for underwear, but apparently you were sorely mistaken), but that disappointment soon disappears as you notice the glowing tent in said boxers.

He really wasn’t kidding when he said he was big. But he was wrong about being too big for you, that was for sure – your mouth practically watered at the sight of his concealed length, and it took all you had not to pounce on him; no, you were still taking this carefully, after all.

Gulping down in an effort to suppress yourself further, you squirmed out of your jeans, kicking the constrictive material off your legs, allowing air to hit your soaking core; it was a good thing you didn’t care too much about this particular pair of panties.

Now, this was where Sans was left slightly at a loss, knowing that he’d be completely nude before you. Seeing his discomfort, you softly place you hand over his knee (ignoring his shiver at the contact – now that you knew what it truly meant, it wasn’t something to be bothered about), smiling at him with equal softness.

“Would you like it better if we both stripped off completely at the same time?….or maybe you’d prefer it if-”

You hand trailed a little higher, edging up his femur.

“-I took this off for you?”

He growled softly under his breath, making to swat your hand off him, which you easily evade.

“woman, you’re going to be the death of me, i swear.”

“Nah, you don’t think that. Really, you want me to do it...”

You edge your body closer, fingertips trailing further still up his femur.

“Really, you want me to undress you, to touch you. That’s what you really want, isn’t it….Sans?”

His breath stutters out of him, his body quivering in clear excitement as your fingertips edged closer and closer to his crotch.

“You’ve got to use your words if you want me to, of course….or perhaps you don’t? Perhaps I should just get dressed-”

“n-no! um. please.”

“Please what?”

He gulped, his sockets huge, eye-lights blown wide as he watched your every movement.

“p-please….please touch me.”

You smirked, leaning forward and grasping the material of his boxers with your teeth, gently starting the process of tugging them down and off him; he lifts his hips almost shyly, face a blushing mess as his erection finally springs free – upon seeing it, you instantaneously lose your careful nature, all but ripping his boxers off the rest of his body, an almost feral noise rippling up your throat at the sight of him.

He watches you warily for a moment as you take in the sight of him, and by god, what a sight – just looking at his massive length alone was making your thighs quiver. But before he can question your thoughts, he lets out a yelp as you bend, trailing a long, languid lick up his length, letting out a breathy moan as you did so.

“f-f-fuck, y/n-”

“Shh...just let me make you feel good, ok?”

Ignoring his faint protests, you run your tongue around his tip slowly, revelling in the sensation – he was so wonderfully smooth, almost like one of your toys; but alive, warm, pulsing with every movement of your tongue. Groaning in faint ecstasy, you finally take him into your mouth, your lips stretching as wide as they possibly could to accommodate his thickness as you trailed your tongue down the underside of his cock. Finally looking up at him, you locked eye-contact as you swallowed him a little deeper into your mouth, hollowing out your cheeks to create suction; and his expression is an absolute picture.

His mouth hangs open, tongue lolling as he gasped and mewled, his cheeks overrun by blue blush; his body squirmed, clearly overstimulated, yet he didn’t pull away from you, and always kept eye-contact with you – it seemed that he was drinking in your expressions just as much as you were his.

Inwardly, you smirk, purposefully swallowing around his length, taking him deeper into your throat, before bobbing your head, now that your mouth and throat were somewhat accustomed to how thick he was; but your movements are short lived as you’re unceremoniously yanked off of him once again. You whine softly, attempting to scramble back to him, only to have him openly laugh (albeit a little breathlessly, thanks to your treatment), thumbs digging into your hip bones.

“pfft, sweetheart, c’mon, if you kept going i would’ve...”

He faltered a little, a little more blush creeping up on his cheeks (not something you’d have thought possible by this point, honestly). You grumble in disappointment, stopping your struggles at last.

“And what if that was what I was trying to do, huh?”

He blinks, clearly not expecting that answer, his grip loosening a little.

“i...uh...”

“Heh, nah, kidding big guy - ‘course I want you inside me, I’d be crazy to pass that up.”

He chokes out a surprised breath, eye-lights turning into tiny hearts momentarily; you chuckle and smirk, before arching in his grip, plastering on your best submissive expression.

“C’mon, don’t you want to fill me up...Sans?”

For a moment, you worry that you’d actually managed to break him, given how long he simply stared at you, frozen; before a low, rumbling growl rose from him, making your toes curl in sweet anticipation.

“I’d be so tight around you, so wet-”

You softly squeak as you’re promptly dumped on your back onto the mattress; before you squeak somewhat louder as he rips both articles of underwear clean off your body, throwing them somewhere behind him. For the briefest of seconds, you think about protesting; but then it occurs to you that you didn’t really care for that particular set anyway.

And him just ripping your clothing off you as if it was nothing was incredibly hot.

You squirm your body purposefully, arching your back and opening your legs; a clear invitation. Sans grumbles above you, eye-lights raking over every inch of you, now completely laid bare to him – his fingers dig into the surface of the mattress on either side of your head, and you frown, confused as to why is was still restraining himself. It then occurred to you that he was probably still worried over breaking you, and perhaps still feeling a little unsure of himself full-stop.

Now, you could, of course, stop. Call it a day.

But your body had no such patience for that.

You keen wantonly underneath him, thrusting your hips up in an effort to meet his, every inch of you screaming how much you wanted this, how much you wanted him, how much you needed his-

You let out a slightly sobbed exhale of relief as he starts to press the head of his cock inside you, letting out a hissing moan as he did so, sockets squeezed shut. You subconsciously angle you hips to make it easier for him, opening your legs a little wider (though truthfully you really wanted to hook your ankles behind his hip bones); you both gasp as his length slips in a little deeper, Sans finally opening his sockets in shock as your pussy hungrily pulled him in.

“y-you’re….you’re ok?”

You whined, thrusting your hips, forcing more of his length inside you; he yelps softly in response, frowning down at you for your impatience.

“...I’m great. I just….I just really need you inside me, please, please-”

A heaving shudder runs through him at your begging, his cock throbbing inside you; but he thankfully listened, grabbing under your behind to force your hips up higher still, slowly thrusting deeper into your core, hissing praises leaving him as he did so.

You knew that he probably wouldn’t last long; you could already feel the tell-tale jerking along his length, could see him shuddering above you – but it hardly mattered, as you knew you weren’t too far behind, you body quivering in glee at how perfectly full you were. And you were only getting fuller.

Your hips jerk against him once again, greedy for more of him; and it seemed you’d timed it at the perfect moment, just as he’d thrust forward himself – before you knew it, his hipbones had slapped against your flesh, both you and Sans letting out quiet screams of surprised satisfaction as he bottomed out. You grinned up at him, squirming deliciously around his length in order to make it easier for him to move.

“Told you that you’d fit.”

He lets out a startled bark of laughter, leaving you to mewl as the movement sends rippling quivers straight to your g-spot. He openly smirks at that, purposefully making his cock jerk inside you, smacking hard against that wonderful, wonderful place.

“y’know, i should probably punish you, for being so damn forceful.”

“You won’t.”

“oh?”

You yelp as he suddenly pulls out, before thrusting back into you just as suddenly; and sure, he might yelped with you, but it certainly got his point across – not that you actually viewed such a thing as a ‘punishment’.  

You grind up against him, trying to move yourself up and down on his cock, suddenly all the more desperate for it, chasing the orgasm that you’d had the briefest of tastes of when he’d thrust inside you.

“More….please Sans! I’m-”

He whines at you continue to grind on him, his phalanges digging into the flesh of your ass, holding you still as you yowled in protest.

“p-please, just wait a sec, i’m really...c-close-”

“Yeah, well, so am I! I don’t care if we haven’t been doing this long, we can do more, please, more, just let me cum, Sans-!”

He snarls, magic flaring in his socket, and for the briefest of moments you worry that you’d actually upset him; before he started to rut into you at an almost furious pace, forcibly bringing your hips up to meet every bruising movement. Your back arches without your consent, sobs leaving your mouth as you’re finally permitted to clench down hard around his cock, muscles twitching with the force of your orgasm; Sans’ breath hitches as he feels you get even tighter around him, his thrusts becoming sloppy – before he, at last, lets himself go, all but roaring as he cums inside you. But instead of the usual amount you’d come to expect when having sex, you gasp in surprise as the sheer amount of cum he’s spurting into you fills you to bursting, dripping from your aching pussy and onto the mattress below. After a good few seconds of filling you up, he shudders, his cock jerking a few more times inside of you, before his body sags; still, despite his obvious fatigue, he carefully pulls out of you, laying the two of you well out of the way of the damp spot.

Grumbling in a satisfied manner, he curls himself around you, sweetly kissing your forehead. You hum happily at the contact, squirming closer to him, snuggling your face against his sternum.

“so….”

“So.”

You hear him audibly gulp, leaving you to giggle.

“Sans, it’s fine. I mean….it was our first time, and I’m not going to lie – that was freakin’ awesome.”

“i didn’t last long-”

“Yeah, and neither did I. Big whoop. I had fun, you had fun – that’s all that matters, you know? I mean, there’s plenty of time to beat out current time, riiight…?”

He chuckles at that, but you can tell he’s pretty relieved.

“i guess. though i wanted to make you cum more than once….”

“Oh? Well, Papyrus is away for the-”

You squeak slightly as he leaps into sudden movement, jumping away and jerking open your legs, before softly kissing your inner thigh.

“nah. sorry sweetheart, you asked for this – i’m thinking that four’s a pretty good number, how about you?”