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Sukuna was 13 when his life changed. At the moment though, while things were definitely different, it was only for the time being.
He never realized how tame this specific event would be in comparison to ten years down the line.
He’s standing in the doorway of his home, red eyes wide as he watches his father gently guide his mother inside, a bundle of something in her arms.
He’s been an only child for 13 years up until this point.
A cold home where he taught himself everything, somehow not the sun the household revolves around despite not having to compete.
His father, Jin, beckons him closer with a warm smile and he hesitates before shuffling forward. Peering around his mother’s shoulder, he sees it.
A pink fleshy thing wrapped in blue swaddling, puffy eyes closed and pink hair that matches his exactly. He wonders if it’ll have his red eyes too.
“His name is Yuuji, he’s your new little brother.”
Sukuna looks up at his mom, her smile not reaching her eyes. It never does.
This entire time he saw Kaori getting bigger but never paid attention, his everyday life hadn’t shifted in the least so why would he?
But now, his life was about to change a lot.
He was already overlooked enough as a child, his basic necessities taken care of but Kaori spared him no warmth and Jin only cared for Kaori, the rotten apple of his eye. Now, things took a turn for the worst.
Yuuji would cry at all hours and Sukuna was losing just as much sleep as his parents. He got no help with homework, started making his own meals, and had to learn how to do his own laundry.
He would say he was miserable but the truth was that he wasn’t. 13 years is plenty of time to learn to fend for yourself, especially when you’re already used to this kind of treatment. It made more sense this way and not having them in his business ended up working in his favor.
At school, he started getting in with the wrong crowd. It started with getting into a petty fight. Someone stole his pencil and he very quietly asked for it back, and not one to really talk in general, they decided to be rude about it.
That ended with them on the floor, lip busted, tooth missing, and sobbing while the other students stare in shock. Sukuna had hit them so hard so many times his wrist was broken, knuckles split.
He felt nothing. No joy, no shock, no sadness, no anger, not even accomplishment. This was just something he felt had to be done.
Sukuna got sent home for a week, his only real punishment to help care for his new brother, now looking uglier, that fresh newborn pink gone and his skin peeling as he gets used to the harsh outside world.
When Sukuna got back to school, people started avoiding him. He didn’t have friends to begin with, didn’t care to, so it doesn’t bother him, but his little stunt had caught the eye of Mahito, a kid in the year above him with scars and a posse of trouble makers.
He was no lackey, but he let them hang around. Didn’t seem to care if they were there or not so he let them hang around like buzzing flies.
Sukuna started getting up to worse, picking his own fights for no reason, getting better at not being caught this time around, smoking cigarette butts, and stealing things from the local convenience stores.
Sukuna’s life was already pretty boring, and now with baby Yuuji in the house, he found it better to delay his return home from school by a few hours. His parents never fussed, too preoccupied.
Not with Yuuji really, just with the art of avoiding their firstborn as they always have.
He’s not sure why Yuuji has more of their love than he did, there didn’t seem to be anything special about him, but he wasn’t really jealous either. It all just seemed too beneath him to care, a passing life event.
As Yuuji grew, he thankfully wasn’t as much of an annoyance. He stopped crying as much when he could open his eyes and he was a fast learner, walking and talking way before he realistically should’ve been.
Yuuji was also, inexplicably, attached to Sukuna. If he spent a lot of time with the kid, it would make sense, but he didn’t, and yet without fail, when faced between choosing his mom or dad, he would find a way to pick Sukuna instead.
Sukuna didn’t mind, as long as it didn’t cause him problems he let the kid do whatever he wanted.
Years passed in a flash and it was clear his life was going down a dark path. Yuuji is now 5, Sukuna 18 and in his last year of high school. His school fights have spread into the streets, he smokes like it’s nothing, drinks, and sometimes even does drugs.
He lets it all wash off his back like water, knowing this is just how it’s going to be.
Mahito and his gang still hang around, doing the same as him, one even going to jail for murder. Sukuna knows he’ll have to leave them all in the dust, the things they do are more petty than anything. He has his eyes set on bigger.
He’s smart and could go to college but he’s had no motivation for anything in his life and the bad things are just so easy. He’s been hearing some things about a local gang and he won’t deny he’s looking into joining their ranks.
For now though, he sighs, just having gotten home from school and lounging on the couch while Yuuji is bouncing in his lap, giggling while watching some kids show.
“Nii-san! Look, look!”
Yuuji’s grubby baby hands point to the screen and Sukuna nods, not actually paying attention. He wraps a large arm around the kid’s middle, forcing him against his chest to still his movements. Yuuji just giggles and settles down, always one to listen to Sukuna more than anyone else.
Sukuna will never understand why Yuuji is so smitten with him but it’s whatever, the back of his mind.
He pulls his phone out, scrolling through text messages and social media, and it catches Yuuji’s eye. It always does.
He turns it to the side, loading an app up before Yuuji can even start whining and they play a racing game together, Yuuji’s hands clumsy and Sukuna’s hands over his to correct all the movements.
Jin comes out of the hallway, his eyes landing on the scene before him and he smiles. He’s always encouraged their bond, caring more for Sukuna than Kaori does, though it doesn’t matter when she rules the house with an iron fist. What she says goes.
Jin walks over and crouches down.
“Yuuji, it’s bedtime, you missed your nap today so you’ll have to go to sleep a little earlier, ok?”
Sukuna kills the game and Yuuji immediately has crocodile tears in his eyes, turning his little body into his older brother, small arms wrapping around a thick neck.
“No! I want to stay up with Suku-nii!”
This happens nearly every night. Those little tears move everyone in the house, a spoiled brat now who only seems to settle down as long as it involves Sukuna.
The subject in question simply sighs, standing up, arms going around Yuuji in return to keep him from falling.
“Don’t worry, dad. I’ll take him.”
Jin nods, a little sad Yuuji never seems to want him, but happy it’s getting done nonetheless.
Sukuna walks past his father without a backwards glance, into the hall and towards Yuuji’s room. He sees Kaori staring at them with a cold gaze from her shared room with Jin, arms crossed over her chest, but she says nothing. Typical.
Sukuna knows she doesn’t approve but she’s not very fond of Yuuji’s tears and shrill screams either.
After entering the room, messy with toys strewn about, he makes sure to close the door behind him. He spends the next hour or so trying to get Yuuji, who is not sleepy in the slightest, to close his eyes and hit the pillow.
Three well worn storybooks later and Yuuji still won’t sleep. Sukuna does what he’s always done, something neither of his parents know he does, and he crawls into Yuuji’s small twin bed with tigers on the sheets and smothers his face with a pillow without hesitation or remorse.
The first few times he did this to Yuuji, years ago, the kid was terrified, crying and thrashing like a wild animal. Still, Sukuna didn’t let up until he passed out from asphyxiation, same as he was doing now.
Though, having done it so many times, Yuuji would giggle, muffled by the feathered down, tiny nails sinking into Sukuna’s tattooed flesh, before slowly losing grip. Sukuna could tell his little brother was blacking out, pressing the pillow over his nose and mouth harder until he goes completely limp.
Waiting a few more seconds, he pulls it off, wiping stray tears from now closed eyes, and leaves the room without another thought.
It’s times like these that he realizes there’s something wrong with him. Where there should be love for his family is just indifference. No sane brother would think this was the fastest way to get a sibling to sleep yet here he was.
Still, there was no permanent damage and Yuuji would be out for the night thanks to him.
He heads to his own room after, not wanting to interact with anyone else for the rest of his waking hours, likely until the birds were chirping the next day.
He reads, plays video games, scrolls social media, the usual, until sometime around one in the morning he hears small sniffles. He stops what he’s doing, keeping an ear out, and just like he expected, there’s a small, almost imperceptible knock on his door before it squeaks open.
Sukuna sits up, fixing Yuuji with a cold stare that keeps him in place.
“Nii-san, I had a bad dream…”
Sukuna lets his eyes wander, his sleep shorts stained. Clearly that wasn’t the only problem.
He sighs and gets up, Yuuji following him around as he sneaks down the hall, back into the room he was in just hours ago, and starts stripping the ruined sheets. It’s not the first time he’d had to do this but Yuuji’s always been a good kid, bedwetting not a common occurrence.
Sukuna runs his hand down his face, rubbing at tired eyes as he shoves everything into the wash, starting a heavy cycle with plenty of detergent and turns back to Yuuji.
“Let’s go get you cleaned up.”
Yuuji nods, teary eyes threatening to spill over as they head to the only bathroom in the house, running a hot bath. It doesn’t have bubbles like Yuuji likes but the kid can suck it up for a night, it’s not time to play.
He strips Yuuji carefully, peeling soaked pajamas off his shaking frame and settling him into the water carefully. He’s next, taking off his own clothes and settling behind his little brother.
He doesn’t really do baths but he feels he deserves to relax for once, his night interrupted and sleep likely to evade him until the sun is up.
He grabs a bar of soap, lathering it up in a rag, before dragging it along Yuuji’s body gently. Yuuji squirms between his legs whenever the rough fabric ghosts over sensitive flesh.
He’s spending more time between Yuuji’s legs, it being the epicenter of the mess, when he lets his mind wander.
He’s 18 now, things at home are tense, with Kaori specifically, and he needs to start getting his affairs in order. It’s only a matter of time before he’ll find himself on the streets, if he’s being realistic.
Lost in thought, he didn’t realize he was washing Yuuji in the same spot over and over, only coming back to the present as little nails dig into his arms. He looks down and Yuuji is red faced, tears streaming down his cheeks with his legs clenched closed around Sukuna’s hand.
He quickly pulls away, alarmed and cursing to himself.
“Shit, Yuuji are you ok?”
Yuuji doesn’t respond, pupils blown and expression far, far away. He shakes him gently but he just melts back into Sukuna.
Sukuna decides not to question it and hoists Yuuji out of the water, bath time over.
Now clean, both smelling like some generic soap, he still does a careful once over to make sure Yuuji wasn’t in any pain. Finding no marks of any kind, he towels the kids down extra careful and puts him in a new pair of pajamas.
Getting Yuuji to sleep was easy. He was pliant and tired, eyes closing and snoring softly in no time, even if the bed was lacking soft sheets and blankets.
After this however, every bath time is a battle. Yuuji screams and cries, only wanting his ‘Suku-nii’, not letting either of his parents bathe him. It’s a complete 180 from when they're actually in the cramped bathtub together, Yuuji playing with water resistant toys quietly and letting Sukuna clean him up.
He would be upset at the sudden new responsibility but with Yuuji behaving so well, he doesn’t mind as much. It makes bedtime easier and doesn’t even last an hour these days.
Things come to a head a month before graduation. He’s been noticeably more stressed with his exit plan, Kaori getting onto him a lot more over the most random bullshit, keeping an annoyingly close eye, when one night, tucking Yuuji in, his little brother says something that makes his eye twitch.
“Nii-chan, can you do the thing again?”
Nonsensical, Sukuna has absolutely no idea what he’s talking about. He tilts his head, a silent request for Yuuji to continue and be more specific.
His little brother squirms under the blankets, taking a tiny hand and grasping Sukuna’s large, calloused one, yanking it between his legs. Sukuna’s eyes go wide.
“The thing from the bath, it felt good.”
Sukuna can barely even remember what happened, just that Yuuji was all limp and trembling in his arms. There’s absolutely no way a five year old came.
He pulls his hand back like it burned.
“What the fuck are you talking about? I didn’t do anything.”
His mind races, trying to piece together what actually happened. Did he accidentally rub his brother to his first orgasm? Yuuji’s way too young for that, not to mention Sukuna doesn’t even swing that way, in many regards.
This is his little brother, on the verge of turning six. He’s so fucked.
He looks back up at Yuuji, grabbing his face in both hands.
“Look, Yuuji, I don’t know what the fuck happened, but you can’t tell anyone about it, ok?”
Yuuji, naive and doe eyed, nods, ready to do whatever his brother asks. Sukuna trusts that he will and relaxes, shoulders slumping. Drawing away from the bed, he stands up, running a hand through his hair.
“Just go to sleep, no whining like usual.”
Yuuji nods again, sensing that tonight is not the night to throw a tantrum or try Sukuna’s patience.
Tucked under his blanket to his nose, Sukuna flicks his forehead, making him giggle, before he closes his eyes. He might’ve fucked up but he’s not a terrible brother overall, right?
Sukuna doesn't stick around to make sure he actually falls asleep, practically running out of that room and to his own.
That entire night sees no sleep from him, going back and forth between pacing so much the carpet wears a path to sitting on his bed, rocking back and forth. He remembers he was distracted that night, surely this doesn’t count right?
He doesn’t like brats.
By the time the sun is up and he’s running late for school, he’s exhausted his emotional patience, giving up on feeling the moral implications of it, and deciding that what happened, happened.
It clears his head a bit but the lack of sleep still has him in a bad mood. That’s how he found himself in a fight before lunch, except this time shit got bad.
Sukuna was feeling a bit sluggish, getting the shit beat out of him. Some punk younger than him wanting to test their mettle. One well aimed punch to his temple has his vision swimming and next thing he knows he’s standing over them, a brick in his hand dripping red, and a suspiciously brick shaped cave in the kid’s skull.
There’s screaming and he looks around, realizing there’s an audience all staring at him in horror.
He’s gone as soon as his mind catches up enough to realize what exactly he’s done. He ran home, sweating and almost panicked. Almost. Maybe this is a blessing in disguise, moving his half formed plans up.
The house is empty when he packs a duffle, except it isn’t.
Kaori is standing in the doorway of his room, arms crossed as she leans on the wood, gaze cold and somehow knowing.
“What did you do this time?”
Sukuna whirls around, eyes bloodshot and narrowed.
“Why do you assume something happened? Maybe I’m just tired of your judgmental ass and decided to drop out.”
Kaori shrugs, not believing him but also not caring enough to extract the truth.
“I would try to convince you to stay, for Yuuji’s sake, but you’re a bad influence. He won’t become what he needs to be with you around.”
Sukuna’s face screws up in confusion. He’s always realized his mother liked Yuuji more, from birth, for some unknown reason but the way she worded that made it seem almost like she has a plan for him.
Considering how bad of a parent she is, Sukuna can’t think it would be anything good, but he also doesn’t care about his family enough to dig deep or protect Yuuji from it. It’s practically inevitable if Kaori has anything to do with it.
He leaves it at that, throwing his duffle on his shoulder, all packed. Without another word, he pushes Kaori out of his way and leaves.
That day, Yuuji runs into the house like he always does, excited to see his older brother, but he’s nowhere to be found. Not the kitchen, living room, bedroom, or even the bathroom. He waits, thinking he must be out with his friends or something but there’s no sign of him that night. Or the next.
After a few days, without his parents even acknowledging Sukuna’s absence besides a hushed argument behind closed doors, Yuuji comes to realize on his own that his big brother isn’t coming back.
He cries, throws tantrums, refuses food and baths, destroys his clothes; any havoc he can cause, he does. Kaori hates it. She can’t control him in the least, which is frustrating in and of itself but even more so when you care about control as much as she.
She was glad Sukuna had left, thinking him a bad influence, but it seems even with him gone, he’s led Yuuji down a path of personal ruin.
It doesn’t take a genius to understand what happened, news reports about a fight at Sukuna’s school leaving a student dead with the obvious suspect being her son thanks to many eyewitness reports and his sudden disappearance.
She answers any questions police have, making him out to be an antisocial monster incapable of human emotion. She’s not entirely wrong, but it was still an accident. Sort of.
Sukuna uses it to his advantage though. The night he left, he headed straight for the biggest crime syndicate in the city. Originally, he was looking at joining a local gang but things weren’t working out and if he was going to live a life of crime, he might as well reach for the stars.
It wasn’t hard to find the boss but getting to him was another matter. He lurks around their base of operations, talking to increasingly important people in the group until they get tired of him asking too many questions. After a week, he’s kneeling in a spacious room, a sack over his head making it both hard to breathe and see, skin blooming in sickly purples and yellows under his dirty clothes.
The rough fabric is yanked off his head roughly, making him grunt, but with his hands tied behind his back he can’t do much about the harsh treatment.
The oyabun immediately recognizes him, Sukuna’s face all over the news the past week, though the story was already losing traction in lieu of the next big thing to cover.
Sake is poured into a small cup before Sukuna, not for him, just in proximity. It’s a small power play, one Sukuna personally finds pathetic, but he wouldn’t voice that opinion when he’s finally gotten this close.
He sits silently, waiting to be allowed to speak.
The oyabun takes a slow sip then starts.
“You killed a kid the other day.”
An accident, well, not on purpose. Sukuna won’t tell him that. A smooth lie finds his lips with ease.
“I wanted to prove I had what it takes before I came to seek you out.”
Eyebrow raised, the large, scarred man in front of him takes a minute to sit with that answer before his head tips back and he barks out a laugh. He lifts a leg and rests his elbow on it, pointing at Sukuna.
“What, to join? …You’re a bit green kid, but I like you. You’ve got guts.”
The oyabun nods to someone behind Sukuna and the bag is immediately thrown back over his head.
He’s released into the streets, thinking he failed, but after a few days of homelessness, no showers and fighting for food, someone bumps into him hard.
He’s about to let his aggression get the best of him, his 18 years of apathy turning into rage with no reason and no outlet, when a piece of paper is pushed into his hand.
He can’t stop the grin on his face from creeping up, sinister and accomplished. Low level grunt but he’s in, shelter being given as well. He’s silently thankful, he wasn’t really a fan of the rough and tough lifestyle he was thrown into suddenly.
The first shower in over a week feels like bliss. The apartment he was given the keys to isn’t great, mold in the corners, rats in the walls, but he didn’t have to pay for it and he has every intention of rising in the ranks to get out of this shit hole.
The first few months weren’t hard, pushing drugs he doesn’t care to know the name of, driving box trucks with merchandise that he swears is whimpering but he stays out of it, or being muscle for gun shipments going who knows where. They seem to cover it all and he takes every job without complaint.
Six months in, cap on his head to cover his main features, now inked all over more than he was before, he’s doing a grocery run back in his old neighborhood like an idiot. Something as mundane as this is rare with how his life is these days so it’s a welcome reprieve, one he’ll learn to never do again after today.
He probably should’ve paid attention to his surroundings because right across the street was a playground, a group of kids all rushing around an ice cream truck.
His little brother, with his new friend Megumi that he made at the start of the new school year, are lined up, waiting their turn.
Big golden eyes catch sight of pink and he turns fast, rubbing at his eyes to make sure he actually saw what he thought he did, and as different as the man across the street looked, Yuuji would recognize his older brother anywhere.
He makes up a lie to Megumi, something about needing to go home all of a sudden, and runs right into traffic. Barely making it across alive, he continues to run until he’s crashing into a leg.
Sukuna grunts as something hits him hard, not to hurt, but definitely making him stumble at the sudden weight.
He looks down and his eyes go wide, watery pools of amber staring right back at him.
“Suku-nii!”
The last thing he expected to see was his little brother. He looks around frantically and grabs Yuuji’s arm tight, pulling him away into a darkened alley around the grocery store’s side. He sneers, words barely making it through gritted teeth.
“Yuuji, what the hell are you doing here? Are you with anyone?”
He is still a wanted ‘criminal’ after all, not including what isn’t known about his dealings with the yakuza. Yuuji shakes his head and Sukuna relaxes, crouching down and letting Yuuji hug him as tight as he can, being six and all. He doesn’t return it.
Snot and tears stain his shirt and Yuuji looks about ready to sob, and inadvertently bring way too much attention to them both.
Sukuna’s quick to drag Yuuji along, a long walk to his shitty apartment, but Yuuji doesn’t pass up the opportunity to memorize the route. He may be a brat with no common sense but this is his big brother he’s talking about.
Sitting the kid on a cum stained couch, he sighs, running a hand down his face.
“So… Yuuji.”
Sukuna honestly isn’t sure what to say or ask. It's awkward as hell and he’s not even sure what Yuuji knows. He sits next to him, arm draped on the back of the couch, pulling Yuuji closer.
“I missed you, no one would tell me where you went.”
Big, curious eyes rove around their dingy surroundings, voice barely above a whisper.
“Is this where you live now?”
Sukuna nods, ruffling Yuuji’s hair and making him giggle, trying to keep those tears away.
“For now. It’s not the best but I’ve nearly got enough money to upgrade. How are things back home?”
Yuuji shrugs, pressing himself further into Sukuna’s side.
“Normal, mom acts like you never existed and it makes me sad. I really miss you…”
Sukuna would lie if he said that pulled at any heartstrings. He didn’t care for the kid, he just didn’t see him as a nuisance or hard to deal with. He still sighs for the nth time, rolling his eyes.
“You can come over whenever you want, but don’t tell mom or dad.”
Calling Kaori ‘mom’ leaves a bitter taste in his mouth but he swallows it down since it’s Yuuji he’s speaking to. He doesn’t intend to actually tell Yuuji how to get here, nor does he expect Yuuji to be able to find out on his own. Let the kid get lost for all he cares, it’s best Yuuji stays far away from him now.
Yuuji gasps, looking up at his big brother, looking ready to have yet another meltdown.
“Really? You mean it?”
He hugs Sukuna hard, not actually waiting for an answer, afraid the offer would get taken back.
That kicks off four years of bullshit.
Sukuna sees the kid so often he wonders if Yuuji even has parents anymore. Whenever he asks, all he hears about is Kaori being a helicopter mom but there’s no way that’s true.
Yuuji’s seen his little hideout more than his own bed, spending the night every weekend and coming over after school nearly everyday. He learned pretty quickly that he was starting to rub off on Yuuji, the kid using his picture perfect innocence to convince their mother he was going to the park, spending the night at a friend’s house, or studying at the library.
Forget the fact that the parents of said kid are never called up to confirm and Yuuji’s grades are subpar at best.
Year after year Yuuji grows up with Sukuna as if they were still brothers in the same calm household.
Really, Yuuji is sitting on couches while Sukuna cleans guns or packs bricks, sipping on juice boxes and watching cartoons while women are walking around half naked and doing things they really shouldn’t do with a kid around.
It took no time at all for Sukuna to get caught with Yuuji by his ‘coworkers’ but the punishment he was expecting never came. They thought Yuuji was cute and doted on him constantly.
Hair ruffling from gruff old men with more bodies than anyone can count make Yuuji giggle and big kisses to the cheek from women with manicured nails and well used throats make him blush.
Sukuna knows that Yuuji knows what’s going on. He might not really be understanding the gravity of it all but he was told to keep quiet and he has.
Six to seven, seven to eight, eight to nine, now to ten. Kaori still none the wiser that her little angel is seeing his rotten to the core big brother behind her back. Jin is even more clueless than her, only seeing what she wants him to see.
Sukuna wonders if he can call social services.
He wonders if that’s why he treated the kid so well. Sure, even after all these years, he still didn’t feel particularly strongly for his little brother, but after two years with the yakuza, he rose in rank and proved his usefulness so he’s been making bank. Three years with more money than he knows what to do with has him sitting easy.
Newer apartment, women at his disposal (not that he used that perk often, the ones that knew how to shut up wore too much makeup and spread their legs too easy for him), and an overwhelming urge to get Yuuji anything he wanted.
Trips to amusement parks, dinners at restaurants where the menus didn’t even display the price, new clothes and toys, literally anything Yuuji wanted, Sukuna provided.
It was a control thing really, proof that he could and so he did. And of all the people that surrounded Sukuna, he figured Yuuji deserved it more than anyone else. Of course, Yuuji became the most spoiled thing in the world.
He was always whining for Sukuna’s attention, pouting up at him with those wide doe eyes that could make any man weak. It never worked on Sukuna but it worked on everyone else. Kid even learned how to shake his hips from a couple of ill intentioned women who thought it would be funny.
Yakuza don’t care about the law so a kid acting like fresh rapebait wasn’t off the dinner table, though no one dared do anything to Sukuna’s little brother.
Currently, he’s looking around bored with bags on his arm, Yuuji in some cute frilly outfit that shows off his thighs running around picking out whatever thing he can get his hands on.
It’s a high end store, needing an insane amount of zeroes in the bank just to walk through the door, and Yuuji is treating it like his playground while Sukuna runs his card nonstop. At least Yuuji has good taste in clothing.
If Sukuna could do the whole ‘letting my brother around me day in and day out’ thing all over again though, he thinks he would’ve made some different decisions. Not let Yuuji around those whores, for one. Another, not walk around the kid naked. Probably also not let Yuuji so close in the morning when they’re asleep, morning wood pressed into the poor thing’s back.
He wonders if Yuuji starting puberty early is his fault. Sukuna didn’t even think that was possible, ten really being way too young.
It all started like any other weekend, light filtering through the blinds with a warm body beside him. Sukuna could stand to sleep in, he always does, but he hears whimpering and feels movement that has him peeking his eyes open.
“Brat, stop moving, it’s too fuckin’ early for this.”
Yuuji tugs on his arm while sniffling and Sukuna groans, his morning instead starting already, clearly.
He lifts his head, bleary eyes struggling to focus on the puff of cotton candy sitting way too close to his face.
“What’s wrong this time? Spoiled brat.”
There’s no venom to it, just a little irritation.
Yuuji shuffles a little closer.
“Suku-nii, I feel weird… It’s been happening a lot lately.”
Yuuji takes Sukuna’s hand and sudden flashbacks from five years ago bounce around in his head like an alarm.
Large, calloused fingers are pressed up against a wet heat and he draws in a breath like he’d die if he didn’t.
He bolts up but unlike the first time, he doesn’t pull his hand away.
Flushed face and teary eyed, Yuuji looks up at him and it all clicks. Yuuji wouldn’t even know what this was, even if he’s accidentally felt it before. This had to be biological right?
“Just… tell me what’s going on, kid.”
Yuuji nods, shuffling closer, now pressing his entire cunt on Sukuna’s palm with his legs wrapped under him, keeping Sukuna’s arm pinned.
“Well, I’ve been feeling tingly and hot, sometimes a little wet. And I’ve been having these weird dreams, like us kissing how mom and dad do but different. With tongue.”
Sukuna groans, dragging his free hand down his face. Of course the kid had no shame, just coming right out with it.
“Ok, and? Do you… know what any of this means?”
Sukuna could’ve sworn that he’d had a sex ed class at this age but clearly Yuuji hadn’t. Not like Kaori would do her job as a parent either if it didn’t involve her weird sense of control.
Yuuji shakes his head and Sukuna very carefully removes his hand from under Yuuji, cringing at the way he whines, then grips Yuuji’s shoulders to steady him, maybe talk some sense into Yuuji while being forthcoming with as much easy to understand information as possible. He doubts it’ll end up that way, though.
“Well, these things happen. They’re normal. Well, not the dreams of us but yeah. You just have to… touch yourself to feel better.”
He can’t believe he just said that. So much for an actual, well thought out explanation. He decides to cut himself some slack since he’s never had to deal with something as weird as this. Close, but still.
Yuuji is looking up at him confused as hell, head tilted like a puppy trying to comprehend a new trick.
“You mean like you did in the bath?”
How the fuck did he still remember that? Sukuna takes a deep breath, mind reeling and willing it to stop so he can actually think. Help Yuuji out the way he needs.
“Well, not exactly like that. I didn’t - I mean, that was an accident. You have to do it on purpose.”
Whatever that’s supposed to mean, he’s still explaining this horribly.
“Can you show me then?”
The question of the hour, so innocent yet so sinful. So wrong.
Sukuna wants to say no, needs to say no. He does not want to do this, but also Yuuji would be lost without him in all aspects of life, this included, so he just nods his head after a moment of tense silence.
He’s never felt so hesitant and unsure about something in his life.
Back to the headboard, Sukuna opens his legs, inviting Yuuji between them. He cringes as Yuuji all but crashes into his chest, head of hair under Sukuna’s nose, sweet and not at all enticing. Still, his breath hitches when Yuuji's back rubs his dick between them.
Yuuji can feel it, has felt it many times, but without a dick of his own, and clearly about to learn his first lesson in anything sex, he hasn’t questioned him about it yet.
Sukuna has no intention to ever teach him either. Leave it up to someone else. This is as far as he’ll go.
He plants his hand on Yuuji’s thigh, so large that he can nearly make his fingers touch on either side. Or maybe it’s just Yuuji that’s so small, so soft too.
Sukuna’s heart races and he doesn’t know why, hoping Yuuji can’t hear the thundering pump of blood next to his ears.
He trails his fingers down, under Yuuji’s sleep shorts, finding sticky panties. The ones he bought Yuuji of course, a see through white pair that a kid had no business owning and a company had no business selling, but Yuuji had seen them in a department store one day and pouted and pouted until Sukuna bought them and now here they are.
He really had spoiled the kid too much.
He tests the wetness, Yuuji squirming under an experienced hand.
“You doin’ ok so far?”
He hates the way those words came out as a whisper, sounding far too intimate. It’s just them here in Sukuna’s apartment with no chance of anyone bothering them, there’s no need to act like they need to be quiet.
Yuuji nods, opening his legs wider on instinct.
Sukuna goes further, pushing the shorts to his little brother’s ankles and getting a good view that he’s decided he doesn’t enjoy, pushing the panties to the side and touching him directly.
A flick to Yuuji’s clit and the kid is already gasping, hips bucking once.
“Suku-nii, that feels weird!”
Sukuna hates being called that right now. He leans his head down, resting his chin on Yuuji’s shoulder.
"That's cause it feels good. Watch closely, when you feel all tingly you’ve gotta do it yourself. Remember, I’m teaching you, this is the first and last time so learn well.”
Yuuji nods as they both watch Sukuna’s fingers prod at his entrance, thumb still rubbing light circles on Yuuji’s clit, enough pressure to keep Yuuji feeling good but not so fast that he would cum and learn nothing.
Sukuna grabs one of Yuuji’s thighs, hips flexible enough to part them wider. He can practically hear his folds part, sopping wet already as he pushes one finger in.
It’s tight so he goes slow, realistically Yuuji’s body isn’t mature enough for anything to go in his cunt, but if puberty is really hitting, it’s only a matter of time anyways.
Plus, it’ll be his cute, little chubby fingers doing this from now on, not Sukuna’s long, rough ones that reach all too deep. He can handle it.
He reaches to the last knuckle, shushing Yuuji as he whines, trying to angle his hips away.
A few pumps softens the kid up, whimpers turning into little moans. He adds another finger, slow and gentle, not Sukuna-like at all. A few more well intentioned and completely brotherly thrusts and Yuuji’s louder, rolling his hips into it.
“Whore.”
He doesn’t mean for it to slip out but Yuuji really does seem like a slut to Sukuna right now, feeling too good for a kid so young, getting off to his brother fingering him all sweet and slow.
He increases his pace and just like he thought, Yuuji only enjoys it more. What was meant to be exploratory and educational shifts, another finger added and the pace increasing. He changes the angle of his wrist, now adding a bit too much force to call this ‘helping his little brother’.
“Three fingers on the first try? What the hell have those sluts been teaching you?”
Yuuji is gasping now, blunt nails digging into the flesh of large, veined arms straining against something Sukuna can’t name and refuses to acknowledge.
The sounds are obscene, echoing off bare walls right back into Sukuna’s ears. His brother is just so wet, getting closer to a peak that feels worlds different from his first orgasm at the sweet age of five.
His cock is aching, twitching with every moan and sensitive from all of Yuuji’s little movements.
When the cunt his fingers are buried in starts to tighten, he knows Yuuji’s close. He plunges in deep, thumb pressing the pink, swollen clit so hard that Yuuji’s head shoots back, howling as tears stream down flushed cheeks, hips bucking, and Sukuna stares in awe as Yuuiji squirts.
He grunts, trying to control himself but his dick has other plans, pulsing until he’s cumming in his sweats, barely any stimulation except the sights and sounds.
The kid has some real talent.
Small body slumping back into his brother, seeking comfort, Sukuna has no time to worry about the state of his own sticky surprises or the implications of any of this as he all but rocks Yuuji back to sleep.
This starts a month of hell.
Every weekend he wakes up hard, first hearing then seeing Yuuji fucking his own cunt with his little grubby fingers, never squirting from his own hands, but always cumming. Always in his fucking face no matter how often Sukuna tells him to knock it off.
What’s worse, Sukuna can’t get off.
In the comfort of his own home, bed, shower, couch, you name it, he can get hard but can never cum. When he gets a girl to do the job for him, he goes soft, which is even worse.
It’s always strawberries and peaches, pink cotton candy hair and a whiny little voice that pops into his mind.
The pressure in his gut gets unbearable and he feels like, despite not even liking kids, or his brother for a matter of fact, that he’s gonna push the kid down to get some relief.
Still, he doesn't stop trying the women route.
Yorozu particularly has been hunting Sukuna since he first joined the yazuka five years ago, even having a hand in him getting promoted to right hand with her influence. She’s obsessed and that’s about to work in his favor.
She’s perfect for this; pretty, crazy, and determined to make Sukuna cum no matter what. Probably thinks she can baby trap him or something but he’ll cross that bridge if he ever gets to it, he just needs his dick sucked or something.
Like everyone else in his life, he feels nothing for her, and fucking her once is a death sentence to a lifetime of her suffocating attention and antics, but he needs a cure for his cock and she’s his last line of defense before he does something really immoral.
Like his little ten year old brother.
She’s way too excited, giggling, and kissing along his jaw too sloppily as he sits on a couch in the clubhouse. He doesn’t care that there are others around, let them watch if they want.
She climbs on his lap, already shedding off her shirt and shoving huge tits in his face, perfumed, sweet and soft, enough to give him a headache.
He lets his hand settle on her waist and it emboldens her, eager to get him out of his pants and into her pussy. What meets her enthusiastic hands is a soft cock, still impressive in size even like this, but also still very, very soft and useless.
She doesn’t care, sliding off his lap and onto her knees, not caring about the sticky tiles below her. She licks at warmed flesh, teasing where the black band he had tattooed years ago lies, sucking on the tip, and drowning his balls in saliva.
He grimaces, not quite liking the feeling of being this wet but he doesn’t stop her.
The best he can give is a twitch, head tilted back and gazing at the ceiling, bored out of his mind.
She still doesn't give up, a manicured hand coming up to help her mouth, jerking him off fast in tandem, teasingly enough to get him hard while still feeling good.
Except it doesn’t. He eventually just sighs, hand on her head pushing her away none too gently.
“You’re fucking useless.”
He knows she’s not the problem, he is, but he’s not going to reveal that. Watching her ego shatter was better than her blowjob attempt anyways.
He gets up, tucking his now uncomfortably wet dick back into his pants, grabbing his keys, and goes home.
Just the walk to his car then out of it into his apartment has him drenched in the downpour that decided to make his night worse.
He strips off his soaked shirt, water glistening off a built body, scarred and tattooed, before he realizes he’s not alone.
It’s a school night and Yuuji, when he’s over, always comes after school but leaves to go back to his actual home before it’s dark out, not the other way around. He regrets giving Yuuji a key.
Sukuna turns his head to see Yuuji lounging at the island in his kitchen like he belongs there. Honestly, at this rate, he really does.
“Fuck are you doing here, brat?”
Yuuji, soft and dry, clearly here before the rain set in, hops off the stool he was dangling his legs on, sucking on a juice box noisily.
“Was bored at home, mom and dad are on a date and I told them I was at Megumi’s.”
Sukuna rolls his eyes, that usual lie somehow always working for the kid.
“I should get you a phone so you can give me a heads up, I wasn’t expecting you.”
His dick twitches and that lingering wetness is suddenly not so disgusting anymore.
He pauses, shakes his head, then pauses again. To Yuuji, he looks stupid. To Sukuna, he’s deep in thought, the angel and devil on opposite shoulders warring with each other.
Who’s he kidding? There is no angel on his shoulder, never has been.
By the time he’s done thinking, his cock is already harder now than it was with Yorozu, Yuuji’s eyes falling to it.
“Brat, what do you say we have some fun?”
This gets his brother’s attention and Yuuji lights up, skipping up to Sukuna who hauls him up into his arms, something he almost never does.
“What are we gonna play?”
His smile is blinding and Sukuna nearly backs out. Not out of love or protecting some type of brotherly sanctity or being a good adult, but simply because he’s not into ten year old little boys. Still, his cock is hard enough so he shrugs the thought away.
“Not play, no games. You know how your cunt tingles and you fuck the feeling away with your fingers?”
His words are crude but Yuuji’s long since been used to it, nodding along innocently.
“Well that can happen with cocks too, and right now I wanna show you something you haven’t learned yet. I promise it’ll feel good for you too.”
He starts walking to the bedroom, nosing under Yuuji’s jaw. It wasn’t a question or a suggestion. He was merely telling Yuuji what he wanted to do.
Sukuna isn’t a monster, sort of. He would stop if Yuuji told him to but the kid was a slut at this point, he knew he’d be stretching that cunt out in ten minutes flat.
The first thing he does has Yuuji all over him, whimpering and clawing at his chest in pure need.
Settled on his bed, not even bothering to turn the light on in his room, he kisses his little brother. He starts slow but his tongue presses against Yuuji’s lips, demanding entrance and receiving it without resistance.
Yuuji’s on cloud nine, having dreamed of this so many times without understanding why but recognizing that he loves kissing his older brother.
Sukuna’s tongue is a lot bigger than his, filling his mouth in a way that makes him dizzy. It isn’t until Sukuna pulls away that Yuuji realizes it was because he wasn’t actually breathing. It’s a familiar feeling from his childhood, not being able to breathe.
A soft chuckle above him and Sukuna’s sitting up, back to the headboard, pulling Yuuji into his lap. Large fingers trace along the hem of Yuuji’s shorts.
“You like kissing, huh?”
Yuuji simply nods, not really trusting his mouth to form words when he’d rather do anything else with it.
“Well you’re not that good at it but that makes sense. Guess big brother’s gonna have to teach you that too.”
He lets his fingers creep up the fabric, higher and higher on sun tanned skin, soft thighs opening in invitation and straddling Sukuna's lap more comfortably.
Sukuna had half a mind to teach Yuuji how to suck him off considering how his hard on started but when he feels how wet Yuuji is right now, slicking through his panties and even his shorts, he huffs and pushes Yuuji right onto his back.
In one smooth move, button and zipper undone, he’s pulling the offending denim off and taking a pretty set of light blue lace with it, leaving a pink cunt waiting to be stuffed, drooling all over his sheets.
“Damn Yuu, have some class.”
Sukuna huffs out a laugh, wasting no time and pulling Yuuji’s ankles toward him to bring their hips flush and sticks two fingers inside without ceremony.
Yuuji’s head snaps back, eyes wide and toes curling. Sukuna can’t tell if the sound he let out was a moan or a scream but he finds he can’t really care at the moment, his dick uncomfortable beneath the tightness in his pants.
Yuuji looks down, watching Sukuna’s arm move as he presses deeper and deeper inside, panting with each new sensation.
“You said we’re going to have fun together, right?”
Amber eyes zero in on Sukuna’s bulge and the older of the two can’t help but roll his eyes. Leave it to the kid to somehow learn about sex without him knowing.
“What do you think is about to happen?”
He punctuates the sentence with another thrust, down to the last knuckle and then slides in another finger. It’s been barely 72 hours since he’s last seen Yuuji cum but over a month since he’s seen Yuuji squirt, by his own hand no less.
He isn’t into kids at all, isn’t into his brother even more so. Still.
While he was expecting an answer, see how far he can go with his little brother without scaring him, the only thing leaving Yuuji’s mouth are increasingly louder moans.
Little hands are clamped around his wrist tight but not strong enough to force Sukuna to stop. He’s so close.
Leaning forward and crowding Yuuji into the sheets, Sukuna overwhelms him with another kiss and Yuuji snaps like a taut bow, back arched and pussy clamping on his fingers, drenching his arm, soaking his shirt, and ruining his sheets.
Sukuna eats it up, moaning in Yuuji’s mouth and refusing to let up, fingering him through his orgasm until it hurts.
He’s not even sure how much time passes before he pulls away, breathless himself with Yuuji faring no better, looking on the verge of passing out and in complete bliss.
“You okay there, kiddo?”
Yuuji nods, body limp and head cotton. Without craning his neck, his eyes drift when he hears a zipper, clearly not his own, being undone, boxers next.
In Sukuna’s hand is a cock Yuuji’s seen before from his many baths with his brother years prior but it looks different.
It’s bigger than he remembers, angry and red with want. There's even a black band tattooed around the base that matches all the tattoos on his body.
“Suku-nii, that’s....”
He trails off, the blush on his chest and neck from the previous exertion climbing to his cheeks for another reason. Sukuna can’t help but stare; his spoiled, cheeky little brother that never seemed to know shame was shy.
“Gonna go inside you? Yeah. Might hurt but you’re a big boy right? You wanna make me proud, right Yuu?”
Is he being a manipulative piece of shit right now? Absolutely. Will he stop? No. He’s already consciously crossed a line, might as well reach the finish line.
When Yuuji nods, he doesn’t wait. The abused cunt pressing against his cock right now is practically begging to be broken into. Sukuna doesn’t care much about virginity but he can’t deny his blood is singing in excitement.
Careful for the first time tonight, he teases Yuuji’s entrance, dragging his cock back and forth between puffy folds, slicking himself up and treating it like Yuuji’s only warning for the rest of their night.
“You ready?”
Useless question, he pushes in without waiting for an answer.
Just the tip at first, testing Yuuji’s give, shushing him intimately like that would help. He keeps going inch by inch, feeling Yuuji stretch impossibly wider around him, eyes glued to his own cock as blood starts painting a gruesome sight.
Yuuji is literally breaking around him, tearing from the intrusion of his big brother, bleeding as a result, the glide slicker.
It hits him in that moment. He’s fucking a kid. His own brother, just ten years old.
He doubles over, stilling his hips as he nearly cums on the spot from the thought. Ok, maybe he does have a thing for his kid brother, but he’ll never admit to it.
Whimpers bring him back to the present, nose to nose with a face so similar to his own, younger, purer, somehow more innocent despite the brat Yuuji’s turned into. Despite the way he’s learned to shake his hips or lick a lollipop in a way that makes grown men pop boners.
There are tears in honey eyes, not yet falling down rosy cheeks but pretty damn close to it. He doesn’t ask if Yuuji’s ok, he knows he’s probably in a pain he’s never had to experience, especially with a body that isn’t really ready for it yet, but he won’t stop now when they’ve already gone so far.
He peppers kisses all along Yuuji’s face, the gentlest thing he could do at the moment while his gut pools with heat and his cock is screaming for friction.
He hears a little gasp when he twitches inside Yuuji and that’s his cue, whatever restraint he had gone.
He pulls out in one go, all the way out, watching how Yuuji’s cunt gapes a little, cock tinged light pink. He presses back in and keeps pushing until he’s bottomed out.
He starts off slow and sure at first, listening to Yuuji’s breathing as the go ahead to speed up every time. Letting his hand wrap around Yuuji’s neck, not tight at first, just there, a sure weight.
Yuuiji recognizes it and immediately tightens up, Sukuna letting a moan slip.
“Shit, this is my fault too huh? You always were a bit weird about the whole not breathing thing.”
He tightens his grip, a far cry from the pillow he used to knock Yuuji out all those years ago. This is different, profound, sensual. The intention is clear, Yuuji’s vision starting to blot with the lack of oxygen, each thrust bringing him closer to an edge he’s felt so many times by now but not experienced quite like this.
With a flat palm to his windpipe and fingers on important veins, blood flow cut off, Yuuji has his second orgasm of the night. He makes no sound this time, just choking noises that only make Sukuna harder inside him, feeling the rhythmic pulse of Yuuji’s pussy clamp down on him.
Sukuna holds it for a second, pulling his arm away right as eyelids start to flutter closed.
Yuuji draws in a big gasp and reaches up with a trembling bottom lip.
Ten minutes flat, just like he thought, Yuuji’s trying to wrap his arms all the way around Sukuna’s broad shoulders, nails biting into flesh as he moans like the whore Sukuna knew he was, taking his cock like a champ as Sukuna sets a more brutal pace, headboard hitting the wall hard.
The proximity is nice, allowing him to bend Yuuji in half, knees hitting a heaving chest, but he kind of wishes he could see the bulge in Yuuji’s gut he just knows he’s making.
Each angle, each deep press, each pause before a brutal thrust draws out more and different sounds that Sukuna catalogues in his head, vision swimming as his own orgasm, the first in a month, starts to approach.
He’s lost count of how many times Yuuji’s broke beneath him, their skin glistening with squirt and froth. He’s lost count of the time too, just focusing on the tight pussy sucking him in each time he pulls out.
“You know this is how babies are made, right Yuu?”
He chuckles as he says it, not intending to knock him up, not even thinking he can at this age, but still thinking it funny to tease his little brother.
Little hiccuping sobs are his only answer, bobble head shaking left to right.
“No baby! Suku-nii, no-!”
A deep thrust shuts him up, eyes wide and tears falling. His pussy is red, overstimulated, and sore. Senses are fried and when his big eyes roll back, he’s shaking again through yet another orgasm.
This little display is too much for Sukuna, catching him off guard as he starts to cum. He gasps, hips stuttering violently, slamming deep into Yuuji until there’s nowhere for his cum to go except an undeveloped womb.
“Fuck, Yuu-!”
He leans in, sinking teeth into Yuuji’s shoulder, only making the little body below him tremble harder.
A good brother would get up once they caught their breaths, clean Yuuji up, maybe run him a warm bath to relax him to sleep, throw on some cartoons. Hell, a good brother wouldn’t have even fucked the life out of Yuuji yet here they are.
Sukuna has accepted that he wasn’t really a good brother a long time ago but now he also has to admit he’s not just a bad brother but a horrible one, a horrible person too.
He can go another round but Yuuji is out for the count, something he can work on later as he has no intention for this to be a one time thing, so he just throws Yuuji around until Sukuna’s on his back with Yuuji tucked into his side.
Sticky, cum rapidly cooling and sheets, likely the mattress too, completely ruined, he forces Yuuji into a tight hug that he swears isn’t a hug and shushes him to sleep.
He’s not far behind, the first orgasm in weeks humming pleasantly under his skin and making his eyelids heavy.
By morning, a lazy late day musing that Sukuna tends to wake up into is interrupted by the sight on his phone. His mother calling him for the first time in five years.
He considers declining it but looks down at the sleeping tuft of pink somehow smushed in his armpit and just sighs, swiping right.
“What do you want, hag?”
His voice is deep from sleep, changed from the last time she heard him, but there’s no sentimentality from her. Kaori is screeching in his ear and Sukuna quickly yanks the phone away from his ear.
“Yuuji didn’t come home last night, do you know where he is?”
Sukuna knows for a fact that she never suspected Yuuji had been sneaking around her back to see him for five years straight but of course her first fishy lead would be her first born. Sukuna weighs the pros and cons.
It was Yuuji’s first time staying out on a school night without being specific he was ‘spending the night at Megumi’s’, it makes sense she would get all up in arms when that helicopter parent tendency of hers would rear its ugly head.
Best case scenario, nothing happens. He lies, sends Yuuji on his way and nothing is found out and they get a little more careful. Worst case, whether he lies or doesn’t, Kaori finds out he fucked Yuuji to tears and then all hell breaks loose.
If the police get involved, that means heat for the group too, which could mean a lot more problems.
“No, I haven’t seen him since I left. Maybe check the playground or something, I don’t know. Whatever a toddler needs or something.”
He hangs up just like that and blocked her number.
By the end of the day there are missing posters and reports floating around town and Sukuna has already buried his identity, Yuuji’s too, diving deeper into the underbelly of the yakuza.
With as high up as he is in the world of crime, the people he knows and the things he’s not afraid to do, disappearing is easy.
And just like that, neither Kaori or Jin see Yuuji ever again, left to a fate that he may or may not have wished for.
Sukuna has no problem spoiling his precious little brother (cum dump) for the rest of his life and knows whatever trail that could have led to him has long gone cold.