itoshi rin — give in to me
requested by anonymous
sypnosis: rin has always liked you, his big brother's girlfriend. sae heads out unexpectedly for a trip, leaving the two of you alone, and you vulnerable to rin.
warnings: nsfw (smut), aged up!rin (18+), dead dove: do not eat, dub/noncon (reader is drugged then gives in), somnophilia, drugging, unprotected sex (p in v), cheating, creampie, light degradation, changing up the past a bit
rin wish he could explain his actions at the moment. he can, actually, it's the why he can't seem to justify. but pondering right and wrong is beyond pointless, and rin doesn't even attempt to stop himself from crushing the pills into a powder-like substance. rin has always liked—no—loved you, and that's the best justification he can give. he can't just leave you in the care of his poor excuse of a big brother, you were supposed to be his.
once sae had returned from his trip to spain, he brought along you. a gorgeous woman who he happened to meet along his stay, eventually developing an obvious romantic relationship. but rin would rather ignore that connection—you're his, and he's convinced you want him too. the way you had tried to sugarcoat sae's words to him when he dissipated his dream was so pathetic—it was cute. maybe, just maybe, you actually cared for the striving kid in him that had just lost his dream and his brother in one night.
rin remembers the night vividly, the lecture sae had given him, essentially calling him useless. he remembers how sae had walked away after that final kick, and how you watched it all unfold from the fence. while his own big brother had walked away, you, sweet you, ran to him. you didn't hesitate to take the boy into your arms, embracing him and attempting damage control. that's when the obsession began. your words were so pointless, but you still tried your hardest. to rin, you looked so pathetic that it was endearing.
rin couldn't let you walk away now.
and that's why he's here, preparing your morning coffee while sae is away on business. he's not entirely sure why you're staying over when sae is gone—but he certainly isn't complaining. after all, he wouldn't have gotten the chance to be alone with you if you decided to just stay home. rin can hear you stir awake in the next room, so he speeds up the process. just before you can enter the kitchen, rin finishes stirring in the last bits of your preferred customization into your coffee—along with the crushed sleeping pills. rin is fascinated with the way they dissolve so beautifully into the liquid, but his attention turns to you as soon as you enter.
and that's how this predicament ensued—with rin pushing the head of his cock into your tight and unaware cunt. you were grateful to rin, for making your energy source for the day, and for remembering exactly how you like it. you giggled softly, letting it slip that sae could never remember your exact customization—and rin's pride inflated from that alone. he knows you better than his stupid, pathetic excuse of a brother and a boyfriend. however, after consuming the last drop of your coffee, there was a noticeable dip in your ability to stay awake. before you knew it, you had passed out right on the couch.
so now you're here, splayed across your boyfriend's bed—but it's not him that's currently on top of you, or pushing inside of you. it's your boyfriend's little brother—rin. the guy who's had a crush on you since he saw you—since you showed care for him. he's pined after you for months, detailing himself on each and every aspect of your schedule, your routine—you, you, you. and now he gets to finally feel the warmth of you, against his bare skin and around his cock. and the best part of it all—he gets to do this to you in his brother's bedroom, on your boyfriend's bed.
rin has you still slightly clothed, with your shorts and panties tossed off to the side. he's fully naked and situated between your legs, relaxed and spread out. it exposes your cunt bare to rin, and he fights a moan that wishes to escape as he grabs the base of his dick. the laugh he lets out is manic as he takes in your form, still covered by sae's shirt that is wrapped around your body. rin pumps his cock once, twice, before finally easing the tip into your pussy. the pleasure is instantaneous, and he throws his head back at the way your walls hug every vein and ridge his cock has to offer. "it's like you were fucking—oh—made for me..."
once the head is fully submerged within your walls, rin experiments with touching the body he's desperately longed for. both his hands find the end of sae's shirt and he pulls the material up to reveal your breasts. "no bra..? it's like you're trying to kill me, slut." rin spits out, suddenly aggressive. it's okay, he reassures himself; you can't even hear a word he's saying, after all.
rin's hands instinctively come to grab at your breasts, big hands wrapping around each one and massaging the mounds of flesh. rin leans down to press kisses along your chest, and he already feels the urge to cum just because of the plushy flesh. though unconscious, his ministrations have you whimpering softly as rin toys with your body—it has rin's mind reeling. he takes one of your nipples between his thumb and his index, rolling the sensitive bud and eliciting a loud, drawn-out moan from your lips. your auditory pleasure sends a shot of arousal straight to rin's pelvis, and he instinctively thrusts—all the way. rin fucking moans as he bottoms out, hyperaware of every single twitch and flutter of your walls around his dick. rin is amazed at how you stay so peacefully asleep—all while he violates your body.
he's hesitant to start moving, still afraid of waking you. but the way you squrim in your sleep, the way your subconscious mewls at the way he touches you—the way you moan his brother's name instead. "mmphh—sae!"
rin can't seem to hold back anymore.
and he doesn't—pulling back his hips just so the tip of his cock remains, just to slam it all back in. the way your tight pussy sucks him back in so easily, and the way it's almost difficult to even pull out has rin addicted. "don't say his fucking name," rin pants out, anger and jealousy melding with lust. "i'm the one making you feel good, not him—he's not even here." rin allows the lust to drain his ration, desire influencing every single action he makes. his hips pull back and into you at an alarming pace, with force that'll definitely cause soreness after you wake up. months after fisting his cock to the thought of you—and he can finally have the real thing.
unbeknownst to rin, the dosage of pills he had placed in your coffee was far too little—and you begin to stir awake. your eyelids flutter open slowly, vision blurry and mind fuzzy. you can barely make out the way rin's cock bullies your insides with messy, uneven thrusts at that spot. rin is too focused on fucking you to notice you're awake, and his thrusts get even more erratic as he feels the sudden shift of how your pussy wraps around him. your walls clench around his dick perfectly, and he moans loudly into your neck at the sensation.
once you fully take in your surroundings, confusion and panic settles in. you take a single glance at the hair color of the man on top of you, and you realize it's nowhere near the color of your boyfriend's. it's rin on top of you—inside of you. it's rin pinning you down, moaning into your ear with unrestrained volume. it's rin that's bullying your cunt—that spot that makes your brain go mushy. "rin...? what are you—"
your words barely register in rin's mind, and your voice only pushes him to thrust deeper into your cunt. mindlessly, he responds without truly realizing you're awake, "shhh.. give in to me." the depth places a new force on your g-spot, and you moan instinctively. the pleasure forces the panic and fear out of you, and your arms come up to cradle rin's neck. rin's still entranced by the feeling of your wet heat—that is until he feels your legs wrap around his waist, effectively lifting yourself slightly off the bed and bringing your body closer to his. he stills momentarily, raising his head to look at you. he's nearly blown away and about to cum at the sight: your head thrown back and eyes closed shut. the next thing you say might as well be his damn luckiest dream.
"please don't stop! feels too—aaaah—good!" you moan out loudly, legs tightening around his body. that encourages rin to keep going, cock plunging into you that it has your arousal audible. "rin!"
now you're really trying to kill him.
rin can feel his orgasm building up quickly, and the way your moans get more unrestrained with every passing thrust only worsens it. he can feel his cock twitching inside of you, all while you can feel his pelvis pounding at your clit every time he bottoms out. the combined pleasure of his dick inside of you and the stimulation to your clit has your knot unraveling. the pressure in your pelvis builds rapidly—and you're close. this is so fucked. you have a boyfriend—but the one inside of you is his own little brother. it hasn't even occurred to you yet that you're in sae's bedroom, in his clothes.
but the string of moans that fall from rin's lips push those thoughts to the side, and it pushes you to the edge. "rin—fuck! cumming, cumming, cumming—i'm cumming!" rin speeds his hips as he chases your orgasm, and his. you clench around him, walls fluttering as you cum—and it guides rin to follow. you can feel how his dick pulsates within your cunt, and how it twitches once, twice, until—spurt! rin cums inside of your pussy in long, drawn-out ropes, and you can feel the way it floods your insides. rin whimpers into your neck as he empties every last drop into your sopping wet cunt, and your body limps against his. you try to process the gravity of what just happened—but pleasure, and the added taboo, is the only thing on your mind.
that changes quickly though as you hear your phone ding! while still holding onto rin, one arm reaches out to grab the device. displayed on the screen is a text message from sae—your boyfriend—the big brother of the guy who's currently still hard in your cunt. your eyes fill with fear as you read the message.
"just landed at the airport baby. be there in 10"
panic once again fills your veins as you squirm against rin, arms flailing in attempt to hit him off you. "rin, get off me! sae's almost home!"
rin only groans as you scramble in his hold, and he can feel the way you drag your pussy all sorts of ways on cock. rin responds unfazed, "good, i'm still hard."
a/n: this is so messy... both literally and figuratively. anyway, it might be a little rushed and repetitive because i literally had no motivation for rin...









