Work Text:
Sukuna felt sick around Yuuji. A sickness beyond modern medicines understanding. It started when they were young. A insatiable urge to cling to Yuuji. His beloved older brother. He took the role of being protective over Yuuji. It was natural to him. It was sweet when he was younger. Five years behind Yuuji, sticking by his side. The family photo album filled with photos of them together— Sukuna glued to Yuuji’s side like some mutt.
Yuuji was a weakness, an illness, to Sukuna. He forced his head to be filled with thoughts that weren’t him. Sukuna didn’t like men, of course he didn’t. He liked no one for that matter. Girls weren’t fun, too delicate and soft. The first time he spent a night with some girl from his class, his first night without Yuuji in their childhood home, he was told he was too rough. He didn’t take his time, treated her like some toy.
That’s all she was to Sukuna. A toy, to be played with. To be tossed around and fucked until he was bored. He got bored fast without Yuuji. He learned that Yuuji’s first semester at college. When Yuuji came back for his middle school graduation, he felt alive again. Too alive. He would feel anger every time Yuuji wore the bare minimum around the house. He would feel his gaze linger far long on his older brother’s chest, his hips, or study the way his shorts hung too low on his waist. He notes to himself that Yuuji’s physique is changing. He must be seeing someone. That thought alone angers Sukuna.
He acts out of his own volition that night, opening the door to Yuuji’s room. The pinup posters left up of his favorite models and actress’. His sporting trophies collecting dust, bed left in the same sheets Sukuna and he picked out years ago. Yuuji is sat in the middle of his bed, typing away on his laptop. He doesn’t look up at Sukuna. It irritates him.
“What’s up?” He asks, bored. Sukuna tries to hide his anxiousness, bouncing on the balls of his feet.
“Do you have a girlfriend?” Sukuna can’t register what flies out his mouth till it’s out. Brash and clumsily just like his feelings around Yuuji.
“No,” Yuuji tears those amber eyes away from the screen. The artificial lighting of the lamp not doing the color justice. “Got girl trouble? Already?” Yuuji smiles.
Sukuna feels the burning under his skin return. He eyes the way Yuuji’s lip quirks up at the corner, revealing that snaggle tooth Sukuna found endearing, and stupid.
“No, I don’t like dumb things like that.” Sukuna huffs. He starts the conversations with Yuuji nine-times-out-of-ten yet struggles to stay engaged in them. “You look different.”
“I think its you who looks different Kuna. You’re bigger than me and dad at this point. What are they feeding you anyway? Can I have some too?” Yuuji jokes.
Sukuna rolls his eyes. Though, Yuuji isn’t wrong. He’s already past Yuuji’s height at fourteen, putting on muscle faster than he can keep track of. If it weren’t for his uniform or school ID no one would believe he was graduating his third year in middle school either.
“You look fine.” Sukuna says, “I eat the same things I always do, same things we always did.” There’s a bitterness in his tone he can’t quite kick. He’s upset. Deep down, he’s angry with himself and Yuuji.
Yuuji notices it. Of course, he always notices Sukuna’s shifts in moods. Yuuji would be the first to note Sukuna was irritated at family events. He would always voice Sukuna’s achievements just as loud as his own. Yuuji was sweet, too fucking sweet for Sukuna. It made his insides churn, swirl uncomfortably. Bile rise in the back of his throat, skin sheen with sweat. He’s aware, too aware, of where he is standing.
In the middle of Yuuji’s room, where it smells like him. Clean, fresh linen, an underlying hint of sweetness that made Sukuna’s mouth water. His tongue feels heavy in his mouth.
“Kuna,” Yuuji’s dejected, maybe upset. Sukuna can’t gather his thoughts quick enough to guess. “Are you upset with me?” He pushes his laptop off his thighs, sitting up to give Sukuna his full attention. It makes him uncomfortable, so fucking uncomfortable. His skin feels like it’s crawling, sweat coating his palms. Yuuji looks so pretty staring up at him. It’s sick. It’s sick and disgusting to feel that way about his brother— another man.
“Shut up. You’re annoying.” He backs into the door, twisting the knob open behind his back, “Don’t bother me.” He turns on his heels and slams the door shut. Yuuji’s muffled voice still echoing through.
“You’re the one who came into my room! You little—” Sukuna doesn’t linger in the hallway long enough to hear the end.
He shuts the door, loud enough to rattle the walls. His own framed photos and hung up medals clattering. He can’t catch his breath, panting heavily. His mind spinning unable to form a thought beyond Yuuji. Yuuji’s lips, his eyes, his gentle smile. All of it makes him sick, he wants to wipe it off Yuuji’s face. He wants to make it unrecognizable.
What pisses him off even more than the way Yuuji bats his eyelashes, is how undeniably hard he is. Yuuji’s voice and scent, something he didn’t know he missed, he felt nausea and arousal sit in an uncomfortable pit in his stomach.
He’s back pressed against his room’s door, paranoia weight heavy on his mind. He closes his eyes, trying to imagine someone other than Yuuji. Behind his eyelids the only picture he can conjure is Yuuji— his soft, reddish pink lips, the freckles on his cheeks, the scar on his lip. A scar that was Sukuna’s fault, a permanent mark that Yuuji was forced to carry around with him.
His hand doesn’t feel like it belongs to him in that moment. Slipping below the elastic waistband of his sweats. He wraps his hand around his leaking cock, hissing at the calloused palm on his sensitive skin. How would Yuuji hold him? Would his hand be able to fit around it properly? Would he stare at Sukuna’s face or be enthralled by his cock?
The unwanted questions push him, further. It doesn’t take long for him to be fucking into this palm, huffing like a dog in heat. Eyes shut tight with images of Yuuji running through his mind. It’s dizzying, intense. Sukuna doesn’t feel like himself, fantasizing about Yuuji in front of him. On his knees, staring at him through long lashes.
He grunts, coating his hand with his sticky, warm cum. It’s filthy, disgusting. He comes to with tears welling in his eyes. He’s sick, unworthy. Unworthy to be near Yuuji. He can’t corrupt him too. He can’t spread the sickness to him. He grabs tissues from his desk, wiping his hand off in a frenzy. He can’t sleep that night, or any night Yuuji stays home with them.
When Yuuji goes back to university, he doesn’t even wake up to say goodbye to him. He hides in his room till their dad’s car is out the driveway. Sukuna feels the weight on his chest lifted. He can breathe again. He can feel the nauseating, skin crawling desire settle. Back down into the darkest pits of his mind.
-ˋˏ✄┈┈┈┈
Yuuji notices Sukuna’s switch up in attitude the first year he comes home for the holidays. He’s less inclined to spend time with Yuuji. After summer break, Sukuna is always busy. When Yuuji visits in the spring, Sukuna has a trip planned with friends. When Yuuji returns in the fall, Sukuna has everything to do under the sun and club activities over break.
Yuuji can’t even congratulate Sukuna on his grades, take him out to reward him, or even ask to watch a movie with him without being met with hostility. Sukuna who was Yuuji’s doting little brother changed into a grumpy, bitter teenager over the course of two semesters. Yuuji’s in his second year of university. He’s stopped coming home for every little holiday. It’s not worth the heartache and rejection from his little brother.
Yuuji is back, though, even when he promised himself he’d stay at a friend’s place in the winter. He hasn’t seen Sukuna in months. Their messages went from lengthy, everyday, texts to a one-worded response if Yuuji is lucky. Yuuji is picked up by their father, without Sukuna waiting for him in the backseat.
“Where’s Sukuna?” Yuuji asks, tossing his duffle bag in the backseat. His plain-style making it easy to pack. He wonders what his brother wears out. Does he style his hair? Does he still wear plain shirts and whatever bottoms he can find? Does—
“At home with your mother, why?” Jin starts driving. Peering over his shoulder while reversing out the parking lot, he looks at Yuuji for a moment before flicking back to the road. “Miss him?” He jokes.
It’s not funny, not to Yuuji. He hasn’t been able to talk to him for weeks. He still laughs, dry with a shrug of his shoulders, “He’s just hard to catch nowadays. I’m surprised he’s even home.”
“He’s not a little boy anymore, Yuu, he was going to grow out of tailing you at some point.” Jin sighs, “I’m just glad it was sooner rather than later. He was a mess when you first left.”
“I doubt it. Kuna’s never a mess.” Yuuji pouts, turning his head to face the window. “He’s an ass, though. That probably won’t change.”
“Yeah, he still is, but he’s a good kid.” Jin smiles, “So, what can you do?” He asks. Yuuji knows he’s not meant to answer. They both don’t mind the silence. Small talk about uni buzzing here and there during the hour long drive. They dance around the subject of Sukuna and Yuuji’s obvious straining relationship.
Yuuji never had to ask about Sukuna before. He always knew the answer. That’s the problem. He always knew and maybe that wasn’t good. Maybe he was overbearing? Maybe Sukuna didn’t like how Yuuji was always pestering him. Maybe Sukuna found a girlfriend, or worse a boyfriend. Yuuji felt sick to his stomach. To share his baby brother with another woman would be torture— another man would be just a cruel joke.
Yuuji is all too eager to leave the car when Jin pulls into the garage. He forgets his bag, ignores his dad’s nagging, and makes a beeline to door. He opens it, excited and giddy. He wanders through the kitchen and into the living room. Sukuna is there, right there. On the couch, idly watching TV. Yuuji smiles, relieved. He feels the nausea fade.
“You’re an asshole, Kuna.” He says, inching over to his not-so-little brother. He leans down to pull him into a hug. Sukuna stiffens, jolting at the affectionate gesture.
“I didn’t do anything,” He speaks through a clenched jaw, “Let go of me, you’re being annoying.” Yuuji doesn’t listen, pulling Sukuna’s face into his chest.
“I missed you. You’re mr. Popular and don’t have time for me anymore.” Sukuna puts a palm on Yuuji’s stomach. His hand is bigger than Yuuji remembers. Easily covering a large expanse of his clothes skin. He pushes Yuuji back, hard. He stumbles, letting go of Sukuna.
He tries to hide the obvious look of hurt on his face. He tries but Sukuna is just as keen to his emotions as Yuuji is to his. He looks away— shame, embarrassment, or guilt? Yuuji can’t tell this time.
“I’m here too!” Their mother’s voice interrupts their staring contest. Yuuji forces himself to look away from Sukuna’s eyes. He swallows his hurt and conjures up a gentle smile for his mother. He walks over to here, engulfing her into his arms. She complains but hugs her son back. Yuuji takes a seat and talks with her for a moment— a moment long enough for Sukuna to slip away.
When Yuuji tries to look for him, tries to talk to him. He’s gone without even a ‘goodbye’ to Yuuji. All Yuuji knows is he’s at some party with a few of his school friends. He feels like his parent’s should care more about this party. Yuuji feels his head swelling with worry at the word, party. Yuuji was a teenager once. A party means booze, too much of it, and hormones.
-ˋˏ✄┈┈┈┈
Sukuna comes home late. He doesn’t remember who even brought him home, just that he’s home. He’s home, and Yuuji’s home. Yuuji’s back home to taunt him with his dumb smile. To look at him with the stupid twinkle in his eyes. He’s stumbling down the hall, swaying back and forth using a forearm against the wall to balance himself. He usually isn’t this reckless, but Yuuji usually isn’t home either.
Yuuji’s hug made the itch return. It made his dick twitch in his shorts, skin tingle with anticipation. When he pressed a hand to Yuuji’s stomach, he didn’t mean to push him that hard. He didn’t mean to make him stumble over his feet and run away, but he felt so disgusting. Like a hormonal kid, his dick getting wet at Yuuji hugging him. He didn’t need Yuuji to be sick like him.
He opens the bedroom door, the wrong bedroom door. He’s greeted with Yuuji’s hunched, sleeping form. His facing the wall, back turned to the door. He looks sweet, peaceful. Sukuna should turn around, walk to the right room. His feet stay planted, firm. Unmoving, just staring at Yuuji. He feels those dark feelings swirl and fester inside him again.
Yuuji looks pretty when his face is resting. His plump lips parted, soft breaths heaving his chest up and down, the way his nose twitches when Sukuna pesters him. Yuuji’s face is something Sukuna could stare at for hours, dissecting every little thing he loves about it. He hates that he can do that. He hates that he yearns for it. His feet shuffle forward. Quiet, using all his concentration to not make a noise. Yuuji’s a heavy sleeper, but Sukuna wasn’t some kid sneaking in his brother’s room anymore. One wrong move, one drunken sway, he’d clamber down to the floor and surely Yuuji would wake up.
He shuffles all the way to Yuuji’s bed as quiet as he can be. His heart beating in his ears, loud. So loud, he’s sure Yuuji would hear it if he was awake. He lifts a shaky hand, knuckle smoothing over Yuuji’s chubby cheek. Yuuji twitches, a little murmur leaving his lips. His nose crinkles, pushing his head closer into his pillow. Sukuna mouth runs dry at how Yuuji reacts. Would he still greet him with that sweetness he did earlier? If he knew these sick thoughts Sukuna had, would he still smile at him?
Why does he want Yuuji to still greet him with fondness? Sukuna struggles, struggles so much because of Yuuji. Just being around him is enough to make his skin crawl, for bile settle in the back of his throat. He hasn’t been this close to Yuuji in some months, maybe a year. His body is tingling, itching. His cock swelling at just the mere idea of Yuuji. It wasn’t his fault, Sukuna settles, It was never his fault. It’s Yuuji’s fault. Yuuji made him sick like this.
Yuuji’s stupid need to please and need to make sure Sukuna was well taken care of made him sick. Sukuna didn’t like men, let alone his own brother. Men make him sick, but Yuuji, Yuuji was a parasite. Infecting his mind, his heart, every fiber of his fucking being with thoughts of him. Sukuna’s fondness for Yuuji was changing, constantly. He loved Yuuji, but he wanted to ruin him. Make him feel the same shame and disgust he felt. Why should Sukuna suffer alone? Yuuji needed to share burden with him.
Yuuji is older. Older brother’s needed to take responsibility. He’s only giving Yuuji what he deserves. The idea of being quiet flies out of Sukuna’s head. He pushes Yuuji onto his stomach, pulling the sheets off his body. He’s only in a thin shirt and his boxers. Sukuna thinks he’s stupid. It’s cold, he should cover up. However, his cock disagrees.
His glides his hands up the underside of Yuuji’s thighs, fingers lifting the tight fabric of his underwear. It’s electric. Nerves firing up with each touch of Yuuji’s smooth skin. He feels so warm under his palms, so soft. He pulls a hand back, clumsily undoing the buckle of his jeans. Yuuji is stirring awake now, trying to turn onto his back.
Sukuna keeps his hip pinned with his other hand, “Don’t fucking move.” He warns.
Yuuji stills, awake enough to listen to the instructions. His sleep voice cracking, “K…Kuna?” Sukuna finally rustles his jeans off, pushing them down with one swoop to the mid of his thighs. Yuuji doesn’t dare turn his head back, trying his question again. A little louder, “Sukuna?”
“What?” He asks, as if he’s doing something normal. His fingers tugging down the band of Yuuji’s boxers. Yuuji’s breath hitches, “Sukuna, what are you doing?” He’s still gentle. Even when Sukuna is being awful, Yuuji is putting his feelings first. Anger bubbles in Sukuna’s gut, “Whatever I want to.” He declares, thumb spreading apart the cleft of Yuuji’s ass. He expects to feel grossed out at the sight of his brother’s hole. He’s mesmerized instead, watching the muscle twitch at the cold air. His cock leaking with more precum like he’s some untrained dog.
He adjusts himself, kicking off his jeans while he straddles Yuuji from behind. “Kuna, this isn’t right—” Yuuji squeaks when Sukuna kisses the tip against the rim. “I don’t give a fuck.” He reminds, “If this is wrong, right, good or bad—” He presses his cockhead deeper against Yuuji’s hole. Forcing him open, “I don’t give a fuck about it.” He pushes in an inch.
Yuuji’s body is burning hot. He’s barely gaining his consciousness, feeling the threat of Sukuna all around him. He can smell the liquor on his breath, hear it in his speech. He can feel the stretch, searing pain spreading through his skin. It hurts. It hurts enough to cause tears to prick in his eyes. A broken gasp leaving his lips when Sukuna pushes in another inch, no warning.
“Kuna, please…” Yuuji weakly protests, trying to push his hips closer to the bed and away from Sukuna. He ignores Yuuji’s pleas, continuing to push himself into Yuuji. Yuuji’s insides feel hot, melting Sukuna down to his core.
Yuuji is pressed flat into his bed, toes digging into the fitted sheets. His fingers reaching over and curling into the pillow beneath his face. Sukuna isn’t gentle with shoving his girth into Yuuji, forcing inch by inch till his hips are flush against his ass. Yuuji’s a mess under him, struggling to flee. Trying uselessly to crawl from underneath him, whimpering through tears about how much Sukuna is hurting him.
‘Kuna, I’m sorry, please.’, ‘Kuna, baby, it hurts.’, and ‘I’m sorry, it’s all my fault…” Even with Sukuna taking Yuuji like this, he’s still saying soothing words to his baby brother. While being used, split open on Sukuna’s cock. Yuuji’s need to apologize to Sukuna.
It infuriates him, tears welling in his eyes. “I don’t get it,” He draws back his hips, seeing the blood from Yuuji’s torn hole leave streaks on his shaft, “Why are you fucking apologizing to me?” Sukuna slams his hips back into Yuuji, ripping a guttural scream from his throat.
“Why aren’t you mad? Why can’t you call me names? Call me disgusting? Tell me I’m pathetic.” Sukuna pushes Yuuji’s head into the pillow. His pace relentless despite the dryness hurting him too. Each drag of his cock causing Yuuji to thrash and squirm, muffling his cries in his sweat dampened pillows.
Yuuji isn’t fighting back, though. As easy as it would be to buck Sukuna off in his drunken stupor and pummel the shit out of him, Yuuji stays there. Under him, letting Sukuna have his way with him.
“Why? Why Yuuji? What the fuck do you want from me?” Sukuna drops his head on the column of Yuuji’s shoulder. Wet tears on his cheeks soaking the fabric of Yuuji’s shirt. His huffing through his own soft cries. Yuuji’s wooden frame creaking against the floor with Sukuna’s hips drilling into him.
Yuuji can’t form a sentence, a thought, anything to say to Sukuna. He’s lost in his own world, biting onto the soft pillow below him. They’re not quiet, far from it. Jin and Kaori surely have an idea what’s going on. Yuuji’s high-pitched moans with Sukuna’s sobs of pleasure. Head board smacking the thin drywall, rattling his pictures and hanging trophies.
Sukuna’s thrusts start getting frantic, keeping Yuuji pinned between his body and the sullied sheets under them. He’s grinding his cock into Yuuji, trying to pound his shape into his older brother’s hole. His nose buried into his shoulder, nosing at it, huffing Yuuji’s scent. Muttering how sorry he is over and over, guilt eating at him while Yuuji’s toes are curling.
Yuuji is addicted to the pain, the way Sukuna’s cock stretches him out. Tearing the delicate flesh of his walls. He can feel Sukuna deep in his stomach, burning, searing pain that tingles every nerve in his body. His body forcing out hoarse, broken cries even if he loves it.
He’ll feel Sukuna with him for days after, and that thought alone sends Yuuji to the edge. His body tensing, hole spasming over Sukuna’s girth. It catches his little brother off-guard. A grunt straight into Yuuji’s ear followed by the hot warmth. Sukuna’s hips stuttering while he grinds it deep into Yuuji. His lower belly full, too full. Sukuna doesn’t stop fucking into Yuuji, pushing out his cum from his ruined hole.
“Take responsibility,” Sukuna chokes out, voice pathetically small, “Take responsibility for making me sick like you…”
“I’ll make it better, Kuna…” Yuuji returns gently, “Let your big brother take care of you, okay?’
Sukuna keeps their bodies pressed tightly together, terrified to pull away. As if Yuuji will cease to exist if he doesn’t stay close, “Okay…” He surrenders, letting Yuuji back into his heart to fester and corrupt him once again.