FILE NAME: SHARING IS CARING!.TXT
USERS FOUND: stepbro!eijirou kirishima x fem!afab!reader x best friend! bakugou
WARNING! THIS FILE HAS BEEN CORRUPTED! DO NOT OPEN! stepcest, threesum, oral (m! and f! receiving), corruption, dubcon, piv, unprotected, dirty talk, coercion sort of, scummy!kiri, ask to tag
NOTES ABOUT THE VIRUS: your stebrother kirishima promised his best friend a taste of the forbidden fruit.
INTERNAL MESSAGE: i don't even care if this flops im posting it for me. happy first kinktober fic! visit the masterlist here!
NEW NOTIFICATIONS! @kaedescara @yaekiss @pvbbyb0y @voidshoutsback @4izawas (want to be added? send me an ask off anon!)
“are you absolutely sure this is gonna go over well, red?”
kirishima huffed out a laugh at his friend’s question, glancing over at him from the driver’s seat of his car as he drove the both of them back to his house. “yeah dude! it’s gonna be great. she’s really sweet, y’know. i’ve already told you everything about her. she’ll be fine.”
bakugou shifted slightly in the passenger seat, jutting out his bottom lip and turning his head to look out the passenger window. the familiar suburban landscape opened up more around them as they turned onto a familiar street, one that they always walked up and down as teens growing up.
it was bakugou’s first time back on kirishima’s street in a long, long time. it wasn’t kirishima’s first, though.
kirishima’s mother had remarried another man after he had moved out of the house, and with him came the introduction of probably the most stunning girls he’d ever seen in his entire life. ‘she’s like an angel,’ he’d mumble over to bakugou across a table in the dining hall, showing him a candid of you in sweatpants and a tight tank top on his mom’s couch, ‘she just lets you do anything to her, man. it’s like a built-in girlfriend. she’s always like, ohhh nii-san…’
bakugou had been apprehensive about the whole situation. he’d known that kirishima had… a thing for that cringe roleplay stepsister porn, but the fact that he was going through with it now that it was a reality had originally made him a bit concerned.
it had taken a lot of convincing for him to agree to come home with kiri for a weekend for … a relaxing getaway, as kirishima had put it.
kiri made the turn into his small driveway and picked up his phone, tapping quickly at the screen. “lettin’ her know we’re here…” he muttered under his breath before the little whoosh sound of the message sending rang through the car.
bakugou took a deep breath, feeling out of his element. he felt like he was walking into a temptation set up by the devil.
kiri whistled to himself as he got out of the car and wandered to the trunk, popping it open to grab their backpacks. they were only spending the night, not expected to be there past sunday, so they had chosen to pack light.
bakugou gathered himself and stepped out of the car, pushing the door shut a little too hard when the front door of the house smacked open suddenly.
and there you were, in tiny sleep shorts and a spaghetti strap tank top, house shoes still on as you grinned and hurried down the stoop to your stepbrother. “eiji-nii! you made it!”
bakugou felt like his mouth was full of cotton as you hurried into kirishima’s arms, nuzzling your face into his chest and kicking a foot up, giggling into him. you were… you were going to rot his brain out. you with those thick thighs, soft-looking skin, clothes tight to your body and the curves of your ass poking out of the bottom of your sleep shorts.
kirishima wrapped his thick arms around your frame and held you tight, pressing his face to your hair and breathing deep, as if he hadn’t just seen you this time last week. “hey, careful! almost knocked me over.” he laughed into you before letting you go to take your shoulders, pushing you back to get a good look at you. “beautiful as always.”
bakugou felt out of place, for the first time in his life, watching his best friend observe his little stepsister, a girl who fell into his lap that he got to stick his dick in. it should be wrong.
kirishima looked over you to bakugou, those crimson eyes of his meeting burning carmine, shark teeth on display. “you remember how i told you my friend was coming over?”
“hm?” you turned and looked over your shoulder, all wide eyes and plush, wet lips that made a knot form in bakugou’s throat. he instinctively clicked his tongue, averting his gaze while kiri squeezed your shoulders.
“i know you remember that i told you he was staying with us this weekend. hope you still don’t mind. you don’t, right?”
you looked up at your stepbrother and pouted, face feeling hot from embarrassment, you had been so excited about your stepbrother coming home that you had forgotten about your guest. you pulled away from kiri to turn towards bakugou, sticking out a hand in greeting. “nice to meet you, sorry for being so rude, i just got excited.”
bakugou looked down at you with a mixed sort of facial expression. it read like he was angry, but he was more frustrated with his own feelings as he grabbed your hand in his to shake it once. (your skin was so soft, you smelled like coconut, you probably just applied lotion, what would your hand look like wrapped around his-)
“nice t’ meet ya too.”
—
kiri was sat on one end of the couch, bakugou on the other, beers in hand as you hummed to yourself while cooking dinner. you had offered, against bakugou’s protesting, and insisted that you needed to be a good host for your brother’s best friend while he stayed in your home. so he had allowed it, staring at you through the entryway into the kitchen from his spot on the couch while he watched the way your shorts bunched further around your thighs, long legs exposed.
kirishima chuckled, startling him out of his trance. “you enjoyin’ the view, bro?”
“this is insane,” bakugou choked out, shifting to face a little more towards kirishima. “this is- this isn’t right. you’re a freak.”
“and yet, you still came.” he shrugged, swirling the beer by the neck of the bottle before taking a swig. “she’s fine with it. she came onto me.”
“i still don’t believe you.”
“dude! i swear! that’s what happened! i was gonna try to be normal about this, yknow. but she wanted me so bad.”
bakugou scrunched his mouth up and sat back on the couch. kirishima was fucking his stepsister who he claims came onto him. kirishima was fucking his stepsister, and he was going to fuck her next.
“dinner’s ready!” you called out, smiling at the pair of them, and kiri grinned oh so innocently up at you as he stood. “you’re such a doll. thanks, sis.” he patted your head as he walked past you, and you just beamed at him.
bakugou could tell you were trying to act like you weren’t sleeping with your stepbrother in front of guests. he could see how you were holding off, sitting at the opposite ends of tables or rooms, fussing with your clothing a little more than someone who was completely comfortable in their skin.
dinner was… interesting. there was a sort of heat in the room that no one chose to acknowledge. you asked bakugou about his classes, smiling so prettily when he gruffly explained what his major was, what he wanted to do after graduation. kiri cracked jokes as always, talking around mouthfuls of food as if he had never learned manners.
things took a shift after you and kirishima did the dishes.
kiri had suggested a movie, except the movie was never picked.
you suggested snacks, too, but the popcorn was never made.
bakugou felt like he had blinked, and suddenly he was on one end of the couch while kirishima was again sat on the other, back to the armrest, one leg kicked up and stretched out on the couch cushions.
you had been pulled into kirishima’s lap after trying to reach over him for a blanket. that had been the catalyst. your back was to kiri’s chest, and his hands had slipped their way up under your tiny tank top to cup your tits with a low groan. “missed you, nii-chan.”
“eiji-nii, what are you-”
“shh, he wants to see. i told him all about us, and i let him know that we were good at sharing.” he mumbled against your ear, his wide forearms starting to bunch the fabric of your tank top further and further up.
your eyes, nervous and embarrassed, were locked dead on bakugou’s, knees knocked together, tits about to be revealed and spill from kirishima’s hands.
kiri was groping his little stepsister in front of his best friend, and he was getting hard.
bakugou felt his nostrils flare as the cogs started to turn in your pretty little head. and then, finally, what he assumed was the real you started to poke through the cracks of your innocent facade.
“is he gonna watch us, eiji-nii?”
“i want him to join. he’s my best friend ever! you think you can help him out? make him feel just as good as you make me feel?”
“only if he wants to…” you murmured and started to chew on your lip, brows furrowed in concern.
the weight of both his best friend and his best friend’s little sister sat heavily on bakugou’s shoulders for just a moment. he could say no. he could get up and call a car right now to take him home. he could call kirishima’s mother, tell her about what her son and precious stepdaughter have been doing behind their backs. it wasn’t right. it was filthy, it could ruin them-
kirishima gripped the front of your tiny tank and tore the fabric off of you, causing you to squeal in surprise and flinch at the sheer show of strength. your tits, soft and pillowy, nipples hard from the groping, fully on display in front of him.
katsuki bakugou had morals, yes. but katsuki bakugou was also merely a man.
“i wanna fuck you, sweetheart.”
kirishima grinned. “told you bro. best pussy you’ll ever get.” kiri turned his attention back down to you, sliding a massive hand down your front to cup your pussy through your sleep shorts. “you’re not even wearing panties, spread your legs, show kats how wet you’ve been for us.”
you, with your head already swimming from the attention, dropped your knees and spread your legs, revealing the damp patch in the crotch of your shorts. bakugou practically choked. if he had just reached over at the dinner table, he could’ve felt your pretty pussy much earlier.
“now then, nii-chan, i want you to treat kats like he’s your big brother too. make him feel really special.”
“red, don’t-”
“trust me.” kirishima’s eyes cut back up to bakugou’s, and bakugou felt something in him falter. he always viewed himself as the leader of their small friend group while growing up, always taking charge in risky situations. but here, on this couch, in a house he practically grew up in, bakugou felt small next to his best friend, who seemed far too in his element to be normal.
you, lips wet and eyes glassy, nodded anyways and looked up at bakugou with a soft smile. “katsuki-nii.”
“oh, fuck.” bakugou breathed out, shifting closer to you on the couch. “let me see you, take those shorts off-”
kirishima helped you lift your hips up for bakugou to get your shorts down and off of your hips, and he practically started drooling at the sight. you, gorgeous you, your pussy drooling and almost clenching around nothing, puffy clit aching between glistening folds.
kiri hummed in the back of his throat, dipping his hand back down and swiping two thick fingers through your lips, making you gasp and shudder. he brought his fingers up to his own mouth with a dirty grin. “she tastes good, bro. you should try it.”
bakugou’s gaze flickered between you and kirishima, before ultimately landing on you. you smiled at him, spreading your legs impossibly wider, reaching up a hand to cup his cheek. “katsuki-nii, please, want you to-”
you didn’t have to say anything else to convince bakugou to drop to his stomach and press his mouth to your sopping cunt, lapping over you with wide strokes of his tongue and groaning into your pussy.
you moaned, a hand flying to his hair while the other braced itself on kirishima’s thigh. you tossed your head back onto kirishima’s shoulder, already trying to rock your hips up to meet bakugou’s tongue halfway.
kirishima’s hands found their way to bakugou’s hair and to your mouth. two of his fingers dipped into your mouth, encouraging you to suck on them, which you gladly obliged, swirling your tongue around the digits and pretending like it was your big brother’s cock.
bakugou felt his hair get yanked, and he hissed before looking up and meeting kirishima’s dark gaze.
“get a good taste, man. you’re gonna fuck her mouth after. don’t let her cum.”
you whined desperately in the back of your throat in protest, but kiri only pushed his fingers deeper into your mouth to make you gag and gurgle around them. bakugou hummed against your clit, sucking your puffy nub into his mouth to really make you leak.
you squirmed in kirishima’s lap, clutching bakugou’s blonde locks as his tongue expertly swirled around your clit and his fingers prodded at your entrance, two of them slipping into your hole without much resistance. you bucked your hips, clenching down hard around his fingers as he crooked them upwards towards the spongey spot inside of you, and bakugou had an inkling of a feeling that he wouldn’t get his treat if he didn’t listen to kirishima.
he felt the way your breathing suddenly changed, and sat up, fingers and the bottom half of his face soaked with your juices.
kirishima pulled his fingers from your mouth, and you cried out in frustration. “katsuki-nii, please! so close, please-”
“don’t you wanna cum on this cock, princess?” kirishima sat up a little more and grabbed his hard cock through his sweats, making bakugou let out a breathy chuckle.
“he’s right, baby. you know the rules. you only get to cum on your big brother’s cock.”
you felt the coil in your tummy start to loosen as kirishima stood and maneuvered out from under you, pushing you back against the armrest. bakugou took the free moment to crawl over you and smash his lips to yours, letting you get a good taste of yourself while on bakugou’s lips.
you heard kirishima remove his sweatpants off to the side, listening to the familiar sound of him spitting onto his palm to start stroking himself to the sight of you being manhandled by someone else.
“kats,” kiri grumbled, and bakugou sat up while wiping his mouth with the back of his hand. “yeah, yeah, ‘m goin’.”
“nii-chan, put your head over the back, yeah? gonna suck katsuki-nii’s cock just like you suck mine.” kiri crawled over you and grabbed your throat to guide your head back. you swallowed and nodded, obeying immediately with a small yes, eiji-nii that made a spike of heat go down bakugou’s spine.
bakugou dropped his sweats and boxers to the floor, stepping out of them to finally give himself a few precursory pumps as you laid back fully on the couch, your head hanging off upside-down on the armrest. you licked your lips as kirishima guided your legs around his waist.
bakugou took a good look at the situation he found himself in. his best friend was hovering over his stepsister, fat cock prodding her entrance, no condom in sight. he swallowed thickly at the little sounds you started to make as he guided his cock through your wet folds, slicking his cock up with your juices. he caught himself staring at kirishima’s back before looking back down to your parted lips and where you started to drool all over your cheeks, and he couldn’t hold of much longer.
“open wide, princess,” he murmured, a hand reaching to grab your throat. you opened your mouth as far as it would go, and bakugou made himself a home in the wet cavity of your mouth.
he groaned, loud and low, his free hand reaching down to flick one of your nipples and grope your breast.
kirishima’s eyes glanced up as he listened to how you gurgled around the thick, foreign cock in your mouth, trying to adjust to the position and the new intrusion.
then he smiled, because he knew he was going to just knock the air out of your lungs. he pressed the fat tip of his cock to your weeping hole, and slammed himself home.
you gagged hard around bakugou’s cock, jerking and moaning out, legs locking instinctually around his waist.
“oh, baby, ‘m sorry. just couldn’t wait anymore, my li’l sister’s pussy was just too pretty for me. you can handle it, you always take it.” kiri grinned up at bakugou, at how his face was scrunched up and contorted with pleasure from how your throat was spasming around his cock.
kirishima started a rough pace, barely giving you room to catch your breath as you did your best to breathe through your nose, bakugou was quick to follow, sinking inch after inch further into your throat with huffs of yeah, that’s it, good fucking girl, taking your brother’s cock, i can feel where ‘m at in your throat.
kirishima reached down to grab your hands and pin them by your head, keeping you fully pinned as the tip of his cock slammed up against your cervix over and over. he was deep, filling you in the best way possible, while his best friend’s fat balls smacked against your face as you sucked his cock.
you felt lost, fully debauched, becoming pliant and fully receptive to their wills. you were a toy, and you loved how it felt on your skin.
bakugou moaned as he felt how deep he was fucking your throat, thrusting harder against you and feeling his legs start to shake. “can’t- ‘m gonna cum-”
“told you she- ah- was good,” kiri groaned as he leaned down to bite into the skin of your shoulder, making you whine and gag again around bakugou’s cock.
you squirmed and thrashed with each hard thrust from kirishima, the force of his hips making you bob harder up and down on bakugou’s cock. you felt stuffed, your legs felt on fire, but you were right on the edge.
bakugou shuddered before whining, sinking his cock deep into your throat to spill his hot load in a place you wouldn’t be able to spit from. you moaned around his length as you felt him cum down your throat, warm spurts and twitching cock making your head spin.
kirishima slowed his thrusts, rocking his hips against you as bakugou took his time riding out his high before stepping back and pulling his cock from your throat.
you wheezed, coughing before absolutely making sure you swallowed every last drop, opening your mouth again and sticking out your tongue to show bakugou that it was all gone.
kiri grinned and chuckled in order to get your attention again. “what a good little girl, swallowing all your brother’s cum. think you can take my load, too?” “please! please, nii-san, please give it to me, make me cum-” you whined loudly as you got the opportunity to wrap your arms around his neck, pulling your big brother in close to you, his massive form towering over you as he practically bent you in half to get deeper.
“i will, i’ll give it to you. shh…” kiri almost sounded affectionate, fucking you so hard the couch started to creak. “fucking- cum for me, cum on my cock, lemme feel you-”
a few swipes of his thumb on your clit sent you finally over the edge, squirting on him and feeling yourself grip down on his cock. he groaned into your shoulder as he came right after you, tumbling into his high and hearing the squelching sounds of his load filling your tight pussy.
he rode out both of your orgasms before finally settling down on top of you, peppering your face with kisses as you shook. then he looked up to where bakugou was sat on a loveseat, dazed, watching from afar.
kiri shifted and opened up a space next to the both of you, and you smiled over at him. “come here, katsuki-nii.”
bakugou swallowed before walking right into the demon’s trap.