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meowuness · 7 days ago

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between brothers // itoshi sae

synopsis: unhappy relationship. no service, trapped in a cabin with your boyfriend’s hot older brother, you’re faced with two options: will you save your relationship, or give up?

pairings: itoshi sae x reader

content: smut w/ plot, infidelity, established relationship with rin, masturbation (f), unprotected p in v sex, vaginal fingering, breeding, oral sex (f & m receiving), cheating on poor rin, very unhappy relationship, (rin slander but i still love him sorry)

wc: 7.5k

rin was perfect, at the beginning of your relationship. now, he barely had any time for you, and when he did, he was talking always about how he’d beat his brother and become number one. you always listened though, because you love your boyfriend.

you’ve been dating for a year and a half, and unfortunately the most interesting thing about your relationship is the sex. those sparks you felt at the beginning? looong gone.

if it wasn’t about soccer, rin didn’t care that much. and he made that very clear. his short replies, and the distance between you two was growing more and more by each second.

coming into a relationship was different for you; you were used to hookups and meaningless sex, so when you met rin, you decided that maybe it was time for you to settle down. the beginning of your relationship wasn’t terrible, and he was a lot more attentive than he is now.

every night, you’ve been sleeping with your pillow and a vibrator. rin spends all day at practice, then when he comes home, he’s too tired to pay any attention to you or more specifically, your needs.

tonight, you hadn’t expected it to be any different from how it is every night. you didn’t bother cooking dinner, he was never there to eat it anyway. when the front door opens at seven pm, you don’t run into his arms and ask him a million questions about practice, you just sit on the couch with your phone in your hand.

you both feel the drift in your relationship, but neither of you do anything to fix it.

rin drops his soccer bag, sweat sticking to his body, before he walks past you. “my mom wants us all to go out for dinner tomorrow night.”

that’s all he says to you.

you can’t help but chew on your lower lip at the sight of your boyfriend all dressed up, and maybe that’s why you’ve stuck around for so long. it sure as hell wasn’t because of the mask of indifference he wears on his face every day. his hand is cold, pressing against the small of your back to guide you through the restaurant.

you hadn’t a clue on who was going to be at that restaurant, and rin hadn’t elaborated on anything more.

rin’s mother greets you with a hug, and his father with a hug. but you aren’t paying attention to them, you’re paying attention to the male sitting across from them; magenta hair, wearing the same stoic expression as rin.

“i’m sure you remember sae, he’s staying here for a few days.” his mother says, helping you to your seat.

how could you forget? rin talks about his brother a lot, even when he claims he doesn’t care.

you smile, and nod your head as your boyfriend takes a seat next to you, oblivious to the way your eyes linger on his brother. “we haven’t formally met.” you say, looking into sae’s teal eyes.

sae barely spares you a glance, his cold teal eyes flickering over you for just a second before returning to his glass of water. he swirls it slightly, the ice clinking against the sides.

“mm.”

that’s all you get—one dismissive sound. no pleasantries, no acknowledgment beyond that single indifferent hum. his posture is relaxed but stiff, as if he’d rather be anywhere else than here in this restaurant with any of you.

his mother sighs like this is normal for him (it probably is), and rin doesn’t even react—too busy glaring down at the menu like it personally offended him.

the silence stretches uncomfortably until sae finally speaks again—though not to you directly, instead addressing rin with a tone that drips disinterest:

“you still playing forward?”

rin stiffens immediately at the question, grip tightening on his menu before he grits out, “..yeah..”

sae exhales through his nose—not quite a laugh but something close to mocking amusement. “hm.” that’s all he says before taking another sip of water like this entire interaction is beneath him.

you watch as rin’s jaw clenches hard enough you can practically hear it from where you sit.

and somehow… somehow, despite how utterly unwelcoming sae acts toward literally everyone at this table—you find yourself intrigued by him anyway.

maybe it was because he was everything rin pretended to be: cold arrogance wrapped in effortless confidence without even trying.

or maybe… you just liked things that didn’t want you back.

their mother clears her throat, after taking a long needed sip of wine. she reaches for their father’s hand, before nodding her head. ��sorry for this..” she says, shooting you a look.

you wave a dismissive hand before she continues, “since our sons love each other so much, and haven’t seen each other, we decided to go on a trip for the weekend. all of us.” rin’s jaw ticks, and sae’s eyes narrow.

their father nods his head, “yeah, and there’s no getting out of it so i suggest just packing your bags and shutting the hell up. we’re leaving friday morning.”

“that goes for you too, y/n.”

your heart beat races, and you side glance your boyfriend, who looks pissed. and that might just be the most emotion you’ve ever seen on his face.

“seriously?” rin asks, and his parents nod their heads. “yeah, all of us are camping, and it’s already planned so no point in fighting it.”

“we’ve already got the cabins rented.”

camping? your eyes widen slightly but you don’t say anything. it wasn’t just going to be a weekend with rin— who’s barely acknowledged you at this dinner table, it was going to be weekend with sae too. and his lack of expression when greeting you, only made you even more interested.

sae lets out a sharp exhale through his nose—almost a scoff. his fingers tap once against the edge of the table, just enough to make the silverware rattle slightly.

“camping.”

he says it like it’s some kind of foreign, ridiculous concept. like he—someone who breathes football and arrogance in equal measure—couldn’t possibly be expected to waste his time with something so... ordinary.

his mother gives him a look that clearly says don’t start, but sae doesn’t even acknowledge it. instead, his eyes flick toward rin for half a second before sliding right past you like you don’t exist. again.

“fine.” he finally mutters, sounding entirely unimpressed by this entire situation (or maybe just life in general). “don’t expect me to enjoy it.”

rin scoffs at that—finally looking up from glaring at nothing on the tablecloth. “like any of us were going to.”

their dad sighs loudly while their mom pinches the bridge of her nose between two fingers as if praying for patience (or maybe divine intervention). meanwhile? you can’t help but notice how sae’s mouth twitches at rin’s response... almost like he finds it amusing beneath all that ice-cold indifference he wears so well.

and then — because fate has decided tonight is full Of Little Moments That Should Not Be Noticed But Are Anyway — sae shifts slightly in his seat... and somehow manages to catch your gaze again without even trying too hard about it...

this time though?

there’s something lingering there behind those teal eyes — something sharp enough to make heat curl low in your stomach before he looks away again like it never happened at all.

after that shit show of a dinner, you’re counting down the days until friday. a few months ago, you gave up on trying to peel the layers of itoshi rin. but now? you had a new mission: itoshi sae. maybe you should feel guilty, but you seriously haven’t had any fun in months.

your friends all moved on with their lives, while you were still stuck in a tasteless relationship.

could anyone blame you for wanting to have fun? if anything, your boyfriend was kinda the one who drove you to this point.

you finished packing your bag on wednesday night, you even packed your best lingerie. god only knows why; you haven’t had sex in maybe a month, so what could magically happen on this trip that you’d need lingerie? you had no idea, but you had hope. a lot of hope.

thursday night, you and rin drove down to his parents’ house so you could leave for this camping trip early in the morning.

the only thing he did do for you was help bring the suitcases upstairs to his childhood bedroom, that happened to be across from sae’s.

and fortunately for you, sae was already there.

the moment you step into the hallway, you can practically feel the tension radiating from under sae’s door. like he’s aware of your presence even before you are—like some kind of predator sensing movement in the dark.

rin’s barely glances at his brother’s shut door as he drops your bags unceremoniously onto his old bed.

“don’t bother unpacking much. we leave at five.”

and just like that, he turns and walks out—probably to go brood alone in some other part of the house. typical.

but sae’s door?

it creaks open just enough for a sliver of teal to cut through the dim hallway light... watching... waiting...

then—click—it shuts again with deliberate quietness before you can even properly process what or who was staring at you from inside that room just now.

you swallow hard against nothing in particular and tries not to think about it too much when choosing which pajamas to wear later — the conservative ones… or the other option tucked neatly beneath them In your bag where no one would see unless they were really looking.

you weren’t in the mood to deal with your boyfriend’s lack of attention towards you tonight, and you couldn’t care less about where you were right now.

you simply groan, zipping your bag up again before taking a seat at the edge of his bed. you weren’t even in the mood tonight, and that was unlike you.

whatever. maybe a shower’ll help.

even with water cascading down your body, and a hand in between your thighs — you don’t feel anything by imagining rin being the one in between your legs. you frown at yourself, two fingers pushing into you and your free hand circling your breast as you dig further into your mind.

you hate it. hate how you don’t feel guilty when you’re thinking about sae, and his slender fingers being put to work instead of yours.

you moan quietly, eyes shutting tightly as water drips down your body. your fingers work faster, and you feel yourself chasing that release you haven’t felt in so long.

and you really can’t help it when his name slips from your lips. not when you think about those pretty teal eyes looking at you.

sae pauses mid-motion, fingers still hovering over his phone screen where he’d been scrolling through some pointless messages from his coach.

his ears aren’t trying to pick up on anything… but walls in this house have always been thin. and even if they weren’t? that sound—soft but unmistakable—would have cut through steel anyway.

for a second, he just… stares at the wall separating his room from the bathroom like it personally insulted him (which, honestly? it kinda did right now). then his jaw tightens minutely as something unreadable flickers behind those teal eyes before being ruthlessly shoved back down into whatever abyss emotions go to die inside him normally.

but then a slow smirk curls at one corner of his mouth despite himself because really? of course this would happen tonight of all nights when you were stuck under the same roof for days starting tomorrow morning...

and isn’t that just fucking ironic considering how little effort rin ever put into keeping what was supposedly ‘his’ satisfied enough not to wander mentally elsewhere these days?

not that sae cares obviously.

except maybe a little bit.

because now there’s an image stuck behind his eyelids every time he blinks —water-slick skin and whispered names that don’t belong to who they should’ve belonged too--and frankly speaking? he hates how intrigued by it all he suddenly is.

he turns off his lamp with more force than necessary before rolling onto his side, eyes fluttering shut.

you should feel guilty about finishing to your boyfriend’s older brother’s face, but you don’t, not even when you lay next to your boyfriend.

the next morning, you’re sitting in between sae and rin. rin’s not facing you, but sae’s body is turned towards you. they’re both not looking at you, though. you feel like you can’t breathe, and everything feels smaller than it really is.

being in this car was just a reminder of how sad your life is; no social life, a boyfriend who ignores you, and nothing exciting happening to you anymore.

you’re a beautiful girl, you know that. so why aren’t things working? why doesn’t he try anymore?

you sigh deeply, gazing out the car window. your thoughts were eating away at you, and you hated it. you always hated thinking so much.

the car ride is suffocating—silence thick enough to choke on, broken only by the occasional static from the radio rin’s father left on too low to actually hear.

sae shifts slightly next to you, his knee brushing against yours for half a second before he pointedly angles himself away. but not before you catch it—the way his teal eyes flicker down at you once. just once. like he knows something.

and maybe he does.

maybe he heard you last night through the walls you’re now realizing are far too thin in the house full of secrets and unspoken things festering under everyone’s skin.

rin doesn’t even seem aware of how close you are to cracking open right between them; his headphones are in, eyes glued to his phone as if this entire trip is nothing but an inconvenience. which, for him… it probably is.

sae isn’t looking at you anymore—but that smirk from last night lingers like a ghost at the corner of his mouth anyway… small and cruel and knowing in ways that make heat crawl up your spine despite everything telling you it shouldn’t be there at all.

his voice cuts through the silence suddenly — cold as ever but with something beneath it now, “you should open your window.” a pause just long enough for tension to coil tighter in the air between them all before he adds, “before you suffocate.”

and oh god does THAT feel like more than just casual advice about airflow inside a cramped car ride suddenly.

“right.” you comment, leaning over rin’s lap to crack the window open.

you look at sae, “better?”

you could almost laugh at yourself, because sae spoke to you before your own boyfriend did this entire car ride. rin’s jaw ticks, and his leg bounces but he doesn’t say anything. he doesn’t need to, because you can already tell that something’s bothering him.

you press your lips together, letting the warm breeze from the moving car hit her face. your eyes are watching the splashes of green and gray from the countryside as they continue driving.

“almost there, guys.” rin’s father says, glancing through the mirror at the three sitting together in the back.

you look at your boyfriend, before reaching to grab his hand.

sae gaze flicks down to your joined hands—only for a split second—but it’s enough. the ghost of that smirk tugs at his lips again before he turns his face toward the window, as if the scenery outside suddenly became fascinating.

rin stiffens under your touch but doesn’t pull away. instead, his fingers remain limp in yours—cold and indifferent, like you’re holding a dead branch rather than the hand of someone who supposedly loves you.

his thumb twitches against your palm—the only sign he even remembers you exist right now—before going still again. sae exhales sharply through his nose at rin’s actions but says nothing else.

“you missed your exit.” sae points out flatly from beside them without even looking up from whatever football analysis is playing on HIS phone screen now instead (because priorities).

their dad curses under his breath before making an abrupt u-turn that sends everyone lurching sideways and somehow in the chaos, you find yourself pressed flush against sae’s side for one fleeting moment— close enough to catch the faint scent of expensive cologne mixed with something inherently him underneath it all— before everything rights itself again... leaving behind nothing but static electricity crackling where skin briefly brushed where it shouldn't have been allowed to brush In first place anyway.

there were two more dreadful hours in this car with the brothers, you hated every second of it. you’re the first to pull your hand away from rin’s, and all he does is side glance you. unfortunately, sae finds humor in this sad relationship you have with his brother.

“and.. we’re here!” rin’s father says, parking the car next to two wooden cabins. he looks back at his sons, and you, an oblivious smile on his face. he doesn’t know that while you’re angry with one son, you’re very interested in the other.

so great. no service. no AC. upset boyfriend. and his hot brother. all in one stupid cabin.

“of course, you three will share a cabin. we’ll take the other one.” their mother comments, shutting the car down and opening the trunk. “unfortunately, there are no AC’s so i hope you’re all okay with that. it’s only for three days, and two nights.”

you want to die. not only is it scorching hot, but you’re carrying three bags into a cabin.

the moment you step inside the cabin, the thick scent of aged wood and stale heat hits you like a brick wall. the air is heavy, suffocating—much like the tension between you, rin (who’s currently slamming his bag onto one of the creaky twin beds), and sae who lingers in the doorway for a beat too long before stepping inside with deliberate indifference.

rin doesn’t even look at you as he mutters, “i call this bed.” as if sharing a room with him was ever going to be anything but an extension of your usual routine: distance wrapped in silence.

sae, meanwhile? he drops his bag onto the other bed without so much as sparing either of you another glance—but not before you catch it: that slow drag of his teal eyes over your sweat-damp skin where fabric clings just enough to outline curves beneath. it lasts half a second at most, yet burns hotter than this godforsaken cabin ever could.

then he turns away again—cold mask back in place—and casually stretches out on his claimed mattress like none of this bothers him at all while his brother sulks across from you both, unaware or unwilling to acknowledge how quickly control of this situation could slip right through his fingers it he keeps neglecting what’s right in front of him.

“you two should get settled.” sae finally comments idly, voice laced with something dangerously close to amusement despite Its usual frost before adding, “before one of you spontaneously combusts from all this... tension.”

you sigh deeply, finally dropping your bags next to rin’s things. you cough softly, looking around the room. it’s not terrible but you definitely aren’t used to it. “you want to go for a walk?” you ask, and he looks at you. straight face, and all. that was your attempt at easing the tension.

“not right now, mom said we’re going out by the fire after we settle in.” rin replies, and your smile falters.

“okay.” you say, turning to unpack your bag. rin never fails to make you feel like a big, fat idiot. and you hate it.

rin leaves the room, off to wherever the hell, leaving you alone with sae. you stop unpacking, and just flop back on the mattress, looking up at the ceiling.

why did you even come? to attempt at getting laid by your boyfriend’s brother?

sae watches from his bed, one arm folded behind his head as he idly scrolls through something on his phone—though the way his teal eyes flick toward you when you fall onto the mattress suggests he’s not actually reading anything.

a beat passes.

then another.

finally, he speaks, his voice low enough that it wouldn’t carry past these four walls even if rin was still nearby. “you look like you regret every life choice that led you here.”

there’s no sympathy in his tone because sae doesn’t do sympathy, but there is a sharp edge of… something. amusement? understanding? either way, it cuts deeper than rin’s indifference ever could.

he shifts slightly on the bed—fabric rustling as he turns just enough to glance at you fully now with those calculating eyes. “shouldn’t have expected anything different from him.”

a pause.

“but you already knew that.”

it isn’t cruel so much as brutally honest—the kind of truth someone only says out loud when they know damn well nothing will change either way... because some people are just stuck in their own patterns until something or someone forces them out.

you prop yourself up on your elbows, looking into sae’s teal eyes before you chew into your lower lip. unfortunately, he’s right. you do regret every choice that led you here. or maybe not. because without rin, you wouldn’t be across from sae right now.

his small acknowledgement was enough to make a slight smile appear on your face, before you sigh deeply.

“it wasn’t always like this.”

sae watches you silently from his bed as you speak, listening to your words with a calculating gleam in his eyes that doesn’t quite match the relaxed stance he’s in. he’s good at reading people, this one. good at seeing past every pretty (or not-so-pretty) mask they put up so yes, he notices it—the subtle resignation on your face in the wake of her own words, the way your shoulders slump like a part of you already accepted this as normal, expected even.

and something about it pisses him off.

”rin doesn’t fix things,” he says flatly, as if stating an obvious fact. “he breaks them and walks away.”

a pause. then, with deliberate slowness, he props himself up onto one elbow—teal eyes locking onto yours like you’re suddenly the only thing in this godforsaken cabin worth looking at. “you still have time to walk away too.”

“i know,” you say, sitting up in the bed across from sae. “i know.” you repeat again, unsure of yourself.

the unspoken or not hangs between you like an open challenge. and for the first time in months? you feel something other than resignation simmering under your skin.

“but i’m not sure if i want to walk away right now.” that was bold, even for you. but it felt good. really good. the implication hangs heavy between you, and your eyelashes bat against your cheek before there’s a knock at the already cracked door.

“mom wants us to go by the fire.” rin says, looking at you then at his brother. you both sit up from your beds, and watch as rin walks away from the now opened door.

sae walks out behind you, and your heart races until you exit the cabin. the sun was already setting, and the fire was already being lit.

the fire crackles in the center of your little gathering, casting flickering shadows across everyone’s faces— rin’s stiff posture, his parents’ oblivious chatter, sae’s razor-sharp profile cutting through the dim light like a blade. you can practically feel the heat of him standing just slightly too close behind you as you both approach the circle.

sae doesn’t sit next to his brother. instead, he casually claims a spot right beside you, one knee drawn up lazily as he leans back on his hands—close enough that if you shifted even an inch? your shoulders would brush.

rin’s eyes dart between you and sae for half a second before he pointedly looks away, but not before you catch it: the faintest tightening of his jaw at how little space exists between you and sae now compared to how much there always is between you.

sae doesn’t react beyond tilting his head just slightly toward you, voice low under cover of laughter from his parents. “changed your mind yet?”

the question could mean anything—walking away from rin? staying? choosing something (someone) else entirely?

“maybe i’m still thinking.” you reply, eyes flickering from the growing fire to meet with sae’s.

“even when the answer’s right in front of you?”

the fire crackles between you all—orange light flickering across sae’s sharp features, catching the cold amusement in his eyes as he watches your breath hitch at his words.

rin’s still sitting stiffly beside you, ignoring you completely in favor of whatever argument his parents are having about marshmallow-roasting techniques. but sae doesn’t look away from you.

not when you stare into his eyes. not when your fingers fumble with a stick trying to spear a marshmallow because suddenly his presence next to you is closer than before, close enough that his breath ghosts against the back of you neck as he mutters, “you’re doing it wrong.”

and oh god—his hands are there too now (supposedly “helping” guide yours), long fingers curling over yours to adjust the angle of the stick with deliberate slowness while rin remains oblivious just inches away.

your breath hitches, and you raise your eyebrows mockingly. “oh really?” you’re teasing him, with your words and your tone. “i needed help putting a marshmallow on my stick?”

rin’s barely paying attention to the conversation happening next to him, and the ghost of a smile on his brother’s lips. you look at your boyfriend, offering him a stick.

“marshmallow?”

he looks at you, “yeah, yeah. hand me the hershey bar too.” is the most he’s spoken to you. the tension in your shoulders release when you pass rin a marshmallow and a hershey bar.

you lean closer to the fire, roasting the marshmallow before teasing sae further. “am i doing this wrong too?”

“tomorrow we’re going to check out this store nearby, then we’ll go canoeing. it’ll be all sorts of fun.” rin’s mother says, roasting her marshmallow.

“fun.” rin mutters, sliding the marshmallow onto his stick.

“yeah, you’re still doing it wrong,” he murmurs low enough for only you to hear, teal eyes glinting with something dangerously close to challenge. “too close to the flame. it’ll burn.”

and sure enough— your marshmallow catches fire a second later. you yelp softly, jerking the stick back as rin glances over at you before returning to his chocolate bar.

sae exhales through his nose—almost a laugh—before reaching over casually... and plucking the charred mess right off your stick with two fingers. he pops it into his mouth without flinching at the heat then levels you with a look that says: “told you so.”

his mother is still clapping excitedly about tomorrow’s plans while their dad pokes at the fire like none of this is happening right under their noses---blissfully ignorant of the way sae’s knee brushes against yours under the log you’re sitting on... or how rin still hasn’t noticed anything beyond his own damn candy bar.

you giggle, “hey! you ate my burnt marshmallow.” a smile’s on your lips, and it’s a pretty sight for anyone to see. sae almost grins, but he settles on passing you another marshmallow.

“try it again.” he says, teasing you lightly. you sit up with a fake determination, pushing the marshmallow through the stick and leaning closer to the flames again.

this time, you don’t push it too far into the fire. and it’s perfect. “quick, graham crackers! and chocolate!”

you place the crackers on either side of the marshmallow, then grab a piece of chocolate from rin’s chocolate bar.

“this is the best s’more you’ve ever seen.” you say, looking at sae.

chemistry flows between you so easily, better than how it’s currently going with you and rin. but then his parents stand up, letting out a yawn.

“okay, we have to get up early so don’t stay up too late. and rin, put out the fire for us. your mother and i are going to lay down now.”

“hm. decent.” he concedes dryly, though the way his eyes linger on your lips when you take a bite betrays more interest than his tone lets on.

as his parents retreat to their cabin, rin finally stirs from his chocolate-induced stupor long enough to grab a bucket of water and dump it unceremoniously over the fire—steam and embers hissing into nothingness around them. “done,” rin mutters, already turning toward the cabin without waiting for either of you. “i’m going to bed.”

and just like that? he’s gone—leaving you alone with sae in the dim glow of dying coals and whatever this tension is between you that keeps crackling louder than any fire ever could.

you look at sae again, and he moves a hand to your mouth, wiping the excess chocolate that resided next to your lips. the act made your breath hitch, but the sound of a dying fire made you snap out of this hypnosis.

“we should probably go back now..” you murmur, standing up from the log. sae nods his head, standing up behind you. and you both walk into the cabin. wordlessly. you won’t acknowledge anything that happened outside, and maybe that’s for the better because when you shower, and go back into the room. it’s rin’s bed you lay in, not sae’s.

and for a second, he forgot that you were his brother’s girlfriend.

sae doesn’t say a word as you slip into rin’s bed but the sharp exhale through his nose is just loud enough to cut through the silence. his jaw ticks once before he rolls onto his side, back facing you and rin.

like hell he’s going to watch this.

rin, oblivious as ever, is already half-asleep with one arm slung over his eyes, and the other hanging off your waist.

you stare up at the ceiling in the dark, painfully aware of two things:

1. you can still feel sae’s thumb brushing chocolate from your lip like it was nothing (it was everything).

2. the space between you and rin has never felt wider or more suffocating than right now.

somewhere outside, an owl hoots—mocking this entire disaster of a situation probably. while inside? the only sound left is three people breathing in sync but never really on same page at all.

sae has to do something to help you open your eyes.

the next morning passes like a breeze, and you’re the last to get ready. when you pass by the couch in the living room, rin and sae are both lounging. there was a gap in between them, surely it was for you? no. they just didn’t want to sit next to each other.

“mom and dad said they’re going to some food market near by, they want one of us to come while the other two stay behind.” rin says, barely glancing up from his phone. he’s mostly speaking to his brother, but you catch glimpses of the conversation when you walk into the kitchen.

sae leans back against the couch, arms crossed—but his gaze tracks you like a predator sizing up prey.

“one of us should go with them,” he says coolly, eyes flicking to rin. “unless you’d rather stay here and bond.” the sarcasm is thick enough to slice with a knife.

rin scowls but doesn’t argue—because even he knows their parents won’t tolerate both brothers ditching for some market trip while leaving you behind alone.

a beat passes. then rin exhales sharply through his nose before pushing off the couch, “fine, i’ll go.”

he looks at you, who’s too busy flipping through the cabin’s welcome manual. “be.. careful.” rin says, grabbing his jacket and stalking out of the cabin.

sae raises his eyebrows, a calm smirk on his lips as he registering the fact that you two are alone again.

“you look so.. pent up.” sae says coolly, standing up from his seat on the couch. your tongue slides over your lower lip, and you turn to look at him.

“maybe i am.” you retort, and he almost smiles at your words. “mhm.” is all he settles for.

you look at the shut door, then back at sae. you feel a rush of excitement, being all alone with him. you feel everything, except for guilt. your boyfriend led you to this.. right?

maybe if he hadn’t neglected you, you wouldn’t have wandering eyes.

sae closes the distance between you in two long strides, his fingers catching your chin to tilt your head. his teal eyes burn with something dark, hungry, his thumb brushing over your bottom lip.

“poor little y/n,” he murmurs, voice dripping with mock sympathy. “so neglected. so lonely.” his grip tightens, his other hand sliding around your waist, pulling you flush against him. “tell me—how long have you been fantasizing about this?”

his lips ghost over yours, teasing, taunting, his breath hot against your skin. his fingers trail down your throat, over the rapid pulse fluttering beneath your skin, down to the neckline of your shirt. “how long have you ached for me to fuck you the way he never could?”

his knee nudges your legs apart, his body pressing your back against the counter, pinning you in place. the heat of him is overwhelming, his scent—smoke and something dangerously intoxicating—filling your lungs.

“no more pretending,” he murmurs, his teeth scraping over your earlobe. “today, i’ll give you what you’ve been begging for.”

you open your mouth to protest, but words don’t come out. not because you have nothing to say, but because you simply can’t deny him. that last bit of self restraint you had? it ripped.

you grab sae by his shirt, pulling him down into a hungry kiss. your teeth clash, your tongues fight, and it’s disgusting. if sae wasn’t so horny, he’d scold himself and you for being so improper.

his hands slide down your body, and you roll your hips against his desperately looking for what you haven’t had in months. it’s pathetic, really.

and when you pull away, you look at him with those sex-craved eyes, like a virgin who’s never experienced this much passion before. all before you drop to your knees in front of him, tongue lapping over your lower lip as your fingers loop through the waistband of his sweatpants.

“you’re disgusting,” sae muses, looking down at you pull his boxers down. his cock springs out free, smacking against your face. “desperate for your boyfriend’s brother.”

you lick your lips at the sight of sae’s cock in front of you; furious red tip already leaking pre cum, and a long thick shaft. your mouth practically drools, and sae only smirks at the sight. you should feel pathetic, really, for how easy you fell into his hands.

your movements are careful, and slow as you wrap your hands around his cock but sae’s not taking it. “you want this,” he snarls, dragging his cock over your lips, smearing pre-cum across your mouth. “want everyone to see a desperate little whore you are for me.”

sae’s fingers guide your head, gripping tight as you take him into your mouth with a hungry moan. his cock throbs against your tongue, the taste of salt and pre-cum flooding your senses as you hollow your cheeks, sucking him deep.

“fuck—“ he hisses, his hips jerking forward, forcing himself deeper down your throat. his other hand braces against the counter, knuckles white with restraint. “such a good little slut for me, aren’t you?”

you whimper around him, your fingers digging into his thighs as you take him to the hilt, your nose brushing the wiry curls at his base. drool spills down your chin, your eyes watering as he fucks your mouth in short, brutal thrusts.

sae’s breath comes in ragged growls, his grip tightening on your head, yanking you back just enough to meet your gaze. his teal eyes are wild, pupils blown with lust. “fuck, we don’t have– have that much time.” he stutters ever-so-slightly, looking down at you.

and then he’s pulling you up, spinning you around, bending you over the counter. your shorts are yanked down in one rough motion, his fingers sliding through your soaked folds.

“so fucking wet,” he growls, pressing two fingers inside you, curling them just right. “all for me, huh?”

his cock replaces his fingers in one brutal thrust, splitting you open, claiming you completely, in ways your boyfriend hasn’t. your scream is muffled by your own arm as he pounds into you, each snap of his hips sending shockwaves of pleasure through your body.

“mphm– sae! s–slow down!” you squeal, tits bouncing against the wood counter with every violent snap of his hips. he pulls you up by the neck, before one hand pushes your tank top up and cups your breast.

“slow down? do you want your boyfriend to walk in on me fucking you on this counter?” sae taunts, lips brushing the crest of your ear. “mhm, i don’t think you do.”

sae’s fingers dig into the soft flesh of your breast, his thumb flicking over your nipple as he drives into you with brutal, unforgiving strokes. the slap of skin against skin echoes through the cabin, mingling with your broken moans. “nghhh!! sae—“

“look at you,” sae groans, his voice rough with lust, his hips snapping forward, burying himself to the hilt.

“taking my cock like you were made for it. rin doesn’t deserve this sweet pussy.”

your back arches, nails scraping against the countertop as pleasure coils tight in your stomach, your walls fluttering around him. sae’s grip on your thigh tightens, his fingers leaving bruises as he fucks you harder, deeper.

sae pulls his hips back, before turning you over to face him. you look into his teal eyes, drool dripping down your chin, and your back pressing against the counter.

next thing you know, your leg is hiked up on his shoulder and he’s fucking into you at a brutal pace. his fingers push into your mouth, muffling your loud moans.

“nghh~! you’re sososo big!” sae replaces his fingers with his lips, pulling you into a messy kiss, all while he’s fucking up into your pussy, abs flexing with every thrust. you moan when his cock pounds into you, almost eight inches of pure bliss.

you look into sae’s teal eyes, your pupils blown. finally, you were breaking him down. breaking those walls. “you’re so fucking— mhm! handsome.” you hiccup, tits bouncing with every violent snap of his hips.

“yeah?”

“sososo fucking handsome.” you repeat.

sae’s grip on your hips tightens, fingers digging into your flesh as he slams into you with a brutal, unrelenting pace. his breath comes in ragged pants against your lips, his usual composed facade shattered into something feral, desperate.

“fuck— look at you,” he moans, voice rough with desire. “taking me so fucking well, gorgeous.”

his cock throbs inside you, stretching you impossibly wide with each thrust. the wet slap of skin on skin fills the cabin, mingling with your moans. sae’s teal eyes burn into yours, dark with need, pupils blown wide—no longer the cold, distant man you first met.

his thumb swipes over your clit, rough and demanding, and you arch against him with a broken cry. his grip on your hips tightening as he slams into you harder, deeper—like he’s trying to ruin you.

his cock pistons into you relentlessly, the thick length dragging against your sweet spot with every brutal thrust. “you needed this,” he snarls, fingers digging into your thighs as he spreads them wider, claiming you. “needed me.”

his hand slides up to grip your throat, not choking—owning. “say it,” he demands, hips snapping forward in a way that makes your vision blur. “say you fucking needed me.”

“i– i needed you so bad.” you cry out, eyes rolling to the back of your head.

sae laughs, his fingers digging into your throat as he forces you to look into his eyes. “damn right, you did. looking at me like that last night, moaning my name in the fucking shower.”

“come for me,” he orders, voice dripping with dominance. “let me feel you fucking ruin yourself on my cock.”

and when you do, when your walls clench around him like a fucking vice, sae follows with a groan, spilling deep, hot ropes of cum inside you, his hips stuttering as he fucks you through both of your orgasms.

for the first time, there’s no mask. just him. just you.

that’s when the reality of the situation hits you: you just cheated on your boyfriend. with. his. fucking. brother.

sae’s fingers dig into your hips, keeping you pressed against him as he pulls out with a slow, deliberate drag, his cock glistening with your slick. his breath is still ragged, his teal eyes burning into your with a mix of satisfaction and something darker—something possessive. “we should probably…. c–clean up.” you murmur, still dazed out.

“clean up?” his voice is rough, edged with amusement as he tucks himself back into his pants, his gaze never leaving yours. “you think a shower will erase what we just did?"

he steps closer, crowding you against the counter again, his thumb brushing over your lower lip. his other hand slides between your legs, fingers pressing against your swollen pussy, smearing his cum deeper into you.

“let him smell it on you,” he murmurs, his breath hot against your ear. “let him see how wet you still are for me. how his brother fucked you better than he ever could.”

you tense at his words, before giving his chest a weak nudge. “i’m going to take a shower before they come back.” you say, slipping past him.

sae only watches you stumble away, his cum still dripping down your thighs. “you forgot something.” he taunts, holding your shorts up with one finger before you turn around and snatch them from his hand.

and maybe that’s how you end up in the bathroom, gripping onto the sink as sae buries his face in between your thighs.

sae’s grip on your thighs tightens, fingers digging into your soft flesh as his tongue flicks against your clit with ruthless precision. the vibrations of his low chuckle against your sensitive skin send shivers up your spine.

“oh, fuck. we don’t– don’t have that much time.” you cry out, voice shaking.

“time?” he pulls back just enough to speak, his lips glistening with your arousal. “you think i give a fuck about time right now?”

his tongue plunges back inside you without warning, lapping up every drop of your slick as his fingers curl against your hips, holding you in place. the wet, filthy sounds of him devouring you fill the bathroom.

one hand slides up your stomach, fingers pinching your nipple roughly, twisting hard enough to make you moan.

“you taste too fucking good to stop,” he groans against your pussy, his breath hot. “and you're lying if you say you want me to.”

“rin can wait,” he murmurs, dragging his tongue up your slit one last time before standing. “i’m not done with you yet.”

the sound of the front door opening barely registers over the pounding of your hearts.

“sae? y/n?” rin’s voice calls out from the living room, and your eyes widen with fear. sae looks at you, then back at the locked bathroom door.

“yeah?” sae calls out to your oblivious boyfriend, placing a hand over your mouth to keep you from making any sounds. oh, fuck.

rin stands in front of the locked bathroom door, lips pressed together in a straight line before he speaks again. “have you seen y/n?” sae bites his tongue, sparing you a glance before replying. “no, she told me she was going on a walk to clear her mind. why?”

“well,” rin pauses, scratching the back of his neck with one hand. “i bought her.. flowers, i just wanted to apologize for everything. i guess, i’ll wait.. then.”

oh, you are completely fucked.

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