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This could have gone better, Sukuna thinks. As it stands, it could have gone worse. Megumi and Nobara are exploring the living room, checking under the kotatsu, in the TV stand, in the linen closet.
It’s a normal house.
The issue is, it is not their house.
It is not even a real house.
Yuuji stands at his elbow, looking miserable while Sukuna pinches the bridge of his nose. “I told you,” He says, quietly.
“I know, I’m sorry,” She turns big, sad brown eyes at him.
Sukuna waves her off, and tries to think how they’re going to get out of this.
A cursed domain. Two small children, who have only recently manifested their techniques, one of them fucking Gojo’s, and his sister’s puppy dog eyes.
If they don’t play house, the domain’s automatic hit will strike the weakest cursed energy within the barrier.
Chiefly, Nobara.
Then, Megumi.
Then, Yuuji.
Yuuji is the only one who’ll survive.
Sukuna steps out of the living room, content to let the kids turn on the TV as he walks into the narrow kitchen.
It’s a modern house, but charmingly classic, with a mixture of nice new appliances, and shoji and tatami. It suits a blend of his own and Yuuji’s preferences, which they normally argue over in their own apartment. Sukuna leans against the stacked washer and dryer in the corner of the kitchen. The brats are still visible from where he stands, and Yuuji follows after him like the lost dog she is.
“We should just let the guaranteed hits -” Sukuna can’t finish the sentence, because Yuuji punches him in his stomach, and he gags, keeling over.
She looks vicious as she whispers back. “No! We’re not letting them die because you’re embarrassed to get caught in a trap!”
Sukuna winces, staring up into Yuuji’s glare. All the people who think they have nothing in common don’t know his brat of a sister. She’s evil when she feels like it. “I didn’t mean I would leave them dead,” Sukuna grumbles.
He straightens up, to catch her lecturing. Sukuna sighs.
“No! We’re not sacrificing any kids! I’m literally responsible for them! You didn’t have to be here! You hate kids, you didn’t have to lurk around the house, being a menace!” Yuuji punctuates her statements with pokes to his chest.
Sukuna catches her wrist, and holds her hand in his. “Enough. You’re right. We both fucked up.”
She fucked up more, but Sukuna won’t hold it against her.
Yuuji should have been more vigilant about a seemingly weak curse lurking in their neighbourhood.
Sukuna probably should not have been hanging around their house, because he was worried about the recent murders in their neighbourhood of families. He can’t always be right, but this time he had decent enough reasons to be wrong.
Sukuna also should have put the obvious together, and realised the seemingly weak curse was behind the issues.
Yet here they are, in the curse’s domain, with the rule of ‘Play House, or Die.’
A perfect family; two kids, a boy and a girl. Mother, and Father.
Issue.
Sukuna’s ‘wife’, is his sister. His younger sister, who he spent all their highschool years defending from the hyenas who surround them panting for a sniff up her skirt. Sukuna thunks his head on her shoulder.
Yuuji wraps her arms around him, and glances at where Megumi and Nobara are quietly playing with the TV. “We can get away with this, right?” She rubs his back.
Sukuna hums, curious.
“If we just act like a couple on like… a sitcom? I’ll kiss your cheek, we share a room, fade to black, yeah? It’ll be fine.” Yuuji, as always, is looking for the silver lining.
Sukuna curls his lip at her. “Did you figure out how this domain works when I wasn’t paying attention?”
She stomps on his foot, and bares her teeth like she’s thinking about biting him. “Nii-chan!”
Sukuna thinks about being petty, and telling her to call him ‘otou-san’ instead. He sighs, reminds himself that picking fights isn’t going to get them anywhere. Even if it is fun riling Yuuji up. He rolls his eyes, and leans his forehead against hers, keeping half his attention on Nobara and Megumi.
Luckily, the little gremlins are used to Sukuna and Yuuji bickering and swatting at one another, so they ignore them. “Worth a shot.” He says.
Small steps. Baby steps. They can play house, like they used to when they were kids.
“Want me to talk to Megumi and Nobara?” Yuuji asks.
Sukuna groans, relieved. “Yes, absolutely.” He can explore the house while Yuuji breaks the news to Nobara and Megumi that they’re their new parents, for now.
That plan goes great for all of five minutes.
Sukuna maps the first floor of the house; kitchen, living room, bathroom. Small patio, three metres of yard with a lemon tree and a sandbox.
He steps back inside the sliding doors, and grunts when Nobara collides with his legs, headbutting him squarely in the groin. Sukuna pats her on the head, trying not to throw her away as the dark haired child grins up at him, feral and missing teeth. “You’re my dad now, huh? Huh? So you’ll play Smash with me?”
Sukuna knows from watching that Nobara is a tiny, competitive goblin, with a rabid love of fighting games that she routinely beats Yuuji at. Sukuna stares at the ceiling, and sighs.
He has a choice.
He can step up, or bow out.
“No, go ask your mom.”
He bows out.
It’s surprisingly liberating.
Nobara pouts. “You’re boring.” She sticks her tongue out at him.
Sukuna snatches her tongue, and crouches to her level, laughing, delighted. “Watch it brat, my house, my rules. You stick that tongue out again at me, and I’m cutting it off.”
Nobara screams, as best as she can while Sukuna pinches her tongue, and when he lets go, she runs off, screaming “Mom!” At the top of her lungs.
That one, unsurprisingly, catches on quickly, and enjoys the game.
Sukuna retreats upstairs before Yuuji can yell at him for threatening to cut out Nobara’s tongue and calling her a brat.
Bedroom for one kid. Bedroom for the other kid. Bougie family they have here. Bathroom. Bedroom for Sukuna and Yuuji, one bed. Eh. No big deal, Yuuji forced him to share a bed with her for way too long anyway, deathly afraid he’d die after their grandfather passed, and leave her alone.
Hell, the brat still crawls into his bed after he comes home from overseas, or a particularly dangerous mission. It’d be annoying if it wasn’t so cute.
Sukuna sits on the floor of their bedroom, cross legged, and closes his eyes, trying to find a weakness in the domain.
He doesn’t find any, so he focuses on finding a weaker spot to make one, should he get the opportunity.
The curse is aware of his actions, he knows.
It might kill one of the kids out of spite. Nobara. The weakest.
A small hand lands on Sukuna’s knee, and then a weight crawls into his lap. He sighs, and opens his eyes, staring down at Megumi’s messy head.
“Can I read here?” Megumi asks. He dragged his book with him. Something a seven year old shouldn’t be reading. Probably more suited to a ten or eleven year old.
Sukuna stares at the ceiling, and curses his existence. He hates kids.
He hates these particular children, because they decided they loved him, the second Yuuji started watching them with regularity for fucking Gojo.
“Yeah. Knock yourself out.” Sukuna’s trapped, on a fluffy white rug, on shiny pine floors, with a lap full of an orphaned seven year old, who literally doesn’t have any parent figures in his life.
When they get out of this, Sukuna wonders if he can force Ieiri to find them both attachment therapy. Nobara has no parents either, as far as he knows, and her grandmother isn’t much of a loving guardian.
Sukuna flops on his back, and thinks, at least there’s AC.
It works surprisingly well, Yuuji’s pleased to note. The Cursed Domain doesn’t change, and the curse doesn’t appear in the mirrors, or the windows, or the TV screen like it threatened to, if they didn’t play by the rules of its domain.
She tries not to be smug, but can’t help it, giving a victorious look to Sukuna everytime Nobara calls them mom and dad.
The first time Megumi calls her mom, however, Yuuji has to excuse herself to the bathroom, surprised by how touched she is by the shy way he says it, her heart breaking.
Yuuji manages not to cry about it until the kids are safely in bed, and she can cling to Sukuna’s back while he pretends to ignore her, reading one of the many, and surprisingly real, books the house came with.
That’s benefitted Sukuna and Megumi. Yuuji was surprised by it, until Sukuna told her the curse reads their personalities, and creates a house that suits them.
Meant to emphasise little flaws, little cracks, in loving families. In their case, the fact that she and Sukuna are not actually married . Yuuji thinks that Nobara and Megumi are supposed to be sad that they don’t have real parents, but instead, both of them have caught the rules of the game and seem to be enjoying it.
There isn’t really a question in Nobara’s case, frankly. She asked Sukuna to dye her hair pink, like theirs, so she is clearly loving the chaos. They’re smart kids. They understand that this is a curse who’s forced them into playing house, but they both seem content to trust Yuuji and Sukuna to be able to get them back home safe.
Yuuji’s guilty about it, but as she sniffles into Sukuna’s shoulders, she doesn’t actually want to stop playing. It’s nice.
Sukuna, generally speaking, lets her snuggle, and be affectionate when he’s around, content to laze around and nap like an overgrown housecat. But he always has to leave, the demand for Special Grade Sorcerers high.
Yuuji’s busy as well, as a Grade 1, and when she isn’t helping the school, she’s working with Nanamin, and she enjoys her work.
They never get to spend time together. This is the longest they’ve spent together since they were both students.
She likes this.
Something moves in the window with a spike of cursed energy, and they’re out of bed, Sukuna cleaving the window clean in half before their feet have touched the floor.
Black oil runs down the wall, and leaves behind four kanji. Daughter and Son are green, while Mother and Father are red.
The window warps, and reforms itself, the sagging grey visage of the curse warbling there. It drags one long haired finger down the glass, and leaves a smear, writing ‘More’.
Sukuna crosses his arms.
Yuuji wipes her eyes, and sniffles.
“You want more?” Sukuna snaps.
The curse trembles, head jerking and chattering like a wind-up toy. “More… give me more….” It whispers before disappearing.
Sukuna turns his annoyed gaze at her, and gestures at the wall. “Look at this. Dog pissed on the fucking wall. This is why I said no pets.”
Yuuji snorts. “This isn’t funny.”
Sukuna rolls his eyes. “No shit.” His shoulders are tense, and he practically throws himself back on the bed.
His book has fallen to the floor, forgotten.
Yuuji sits beside him, and tucks her feet up, crossing her legs. “I guess just getting Megumi and Nobara to call us mom and dad could only work for so long.”
“Fucking dog’s a voyeur.” Sukuna grumbles.
Yuuji’s face flushes and she slaps him on the stomach. She doesn’t appreciate the sex joke.
He might fuck around, but she hasn’t!
Partially because Sukuna terrorised every single person who might have been interested in her, and even some people who weren’t even remotely interested.
“You know, if someone’s the actual dog around here, it’s you. If you let me have a real boyfriend, we wouldn’t be stuck doing this. You could be Uncle Sukuna, not daddy.” Yuuji picks at the hem of her shorts. She needs to blow her nose.
This is really cramping her vibe. She just wanted to cry about how cute Megumi is, and how she might actually want to be a mom in peace. She leans over Sukuna’s legs, and gets a tissue, wiping her face before blowing her nose.
“I’m not the one who’s only attractive to scumbags.” Sukuna gripes.
Yuuji thinks about punching him. They could keep at this years old argument, that neither of them have any deep stakes in, but they’ll still have to confront their dilemma eventually.
“Yeah, yeah.” Yuuji throws away her tissue and flops down beside Sukuna.
“Go wash your hands, nasty.” He says.
“Go wash your back then, because I was crying all over you.” Yuuji grits out, ready to start punching him.
Sukuna wedges his arm under her shoulder and pulls her to his side, and all the fight leaves Yuuji.
Yuuji is an unholy snuggler. Yuuji will take any hug, anywhere, from almost anyone. It’s why she gets along so well with Satoru; she’s unphased by his occasionally rancid attitude, and she loves hugs, even when they’re inconvenient.
If she’s honest, she actually likes them a bit better when they’re inconvenient.
But Sukuna is prickly. He touches her either when he thinks she’s stressed, or in the rare times he is. Otherwise, he lets her cling, but rarely touches back.
Which brings her back to the issue of Playing House . Yuuji’s getting spoiled by Sukuna’s casual affection, and she isn’t sure how she’s going to go back to how things were before without missing it.
Yuuji pulls her hair out from under them, and rests her head on Sukuna’s shoulder. “We’re not playing hard enough, huh?” She says, as Sukuna’s thumb rubs absently over her shoulder.
“Nope. Turns out the sitcom approach only got us so far.”
Yuuji looks at him, and swallows. He’s staring at the ceiling. “What do we do?” She asks.
This would be much easier if Sukuna’s domain had a barrier, but it doesn’t, so they can’t bash their way out that way. Yuuji doesn’t have a domain, so she can’t help.
If Sukuna opens his domain, to guarantee a hit on the curse, the curse has guaranteed collateral.
“We can’t fight our way out,” Yuuji says.
Sukuna shushes her. “I’m thinking, brat.”
. “You probably shouldn’t call me that. You call the kids brats. Call me something you’d actually call a girlfriend.” Yuuji says. She’d considered just letting the nickname hang, just a part of Sukuna’s caustic affection, but it goes against the spirit of this arrangement.
Yuuji wracks her brain, trying to remember who Sukuna’s last girlfriend was.
“Pah. I’d just call you mine, and I already do.” Sukuna glances at her.
Yuuji stares at him, the serious look in the red of his eyes, his pink eyelashes on his cheeks. Yuuji might like it when Sukuna calls her his, like this. “Okay.”
The moment’s broken when Sukuna flicks her in the forehead, scowling. “Hey, dunce, how the fuck do you think I’ll go about that? Just saying, ‘Hey, mine, toss me a blanket would you?’”
Yuuji scowls, pulling her head back, “I don’t know! I’m trying to figure something out, not just brooding like an asshat!”
Sukuna grits his teeth and scrubs his palms over his face. Yuuji’s head gets squished between his bicep and forearm in the process and she makes angry rumbles, preparing to bite.
Sukuna jostles her until she slides to faceplant into his shoulder, her bangs sticking on his jaw.
“Do we cuddle more?” Yuuji asks.
“This would be easier if we had parents to emulate.” Sukuna says. His tone is overly wry.
Yuuji has vague memories of what Grandpa did with their grandmother, from stories, and she wonders if Sukuna recalls it more clearly. “Gramps said Grandmother always kissed him good morning and good night, even if they were fighting.”
Sukuna sucks on his teeth. He looks at Yuuji. “She did.”
“Do you remember it?” Yuuji asks, peering up through her hair at him.
Sukuna pushes her face back into his shirt, and she halfheartedly bites him. “No, dumbass. She was in the hospital, from what I remember. I was thinking of the old man’s drunken laments.”
“Don’t disparage him like that.” Yuuji says. Her voice is muffled by his shirt.
Sukuna might not care, but she does.
Sukuna’s hand briefly pats her head in a silent apology. Jerk. Forgiven.
Yuuji rolls onto her side, facing Sukuna with her head getting pleasantly crushed under his arm, and wraps her arms around his waist. “Do you think it’s a good idea?”
Sukuna inhales deeply, and exhales through his nose. “Cuddle more, and kiss good morning and good night?”
Yuuji thinks about it. “Didn’t I do that when I was younger?” She asks. She has vague recollections of chasing after Sukuna, trying to cling to his shirt, and demanding kisses.
Sukuna’s lips twitch, like he’s trying not to smile. “You stopped when I told you to close your eyes and made you kiss a bug.”
Yuuji is faced with the sudden, and visceral memory of kissing a cicada shell. She shudders, and Sukuna giggles, turning his face into his opposite arm to hide his cackling.
“I hate you.” Yuuji deadpans, and wiggles out of Sukuna’s freestyle headlock.
“Ey,” Sukuna sits up after her, once he’s gotten over laughing at her as Yuuji scoots back into her side of the bed, nuzzling into the blankets and turning her back to him. Leave it to Sukuna to bring up something awful he did, that Yuuji forgot, so that he could laugh at her some more.
“You’re evil, shut up.” Yuuji grumps.
Sukuna hums, “Hn, no disagreement there, but, Yuu-chan,” his hand closes on her shoulder and he rolls her onto her back. He taps his cheek. “Kiss.”
Yuuji pushes herself up onto her elbows, scowling, and gives Sukuna the most lacklustre kiss on the cheek that she can manage. Sukuna cackles again, and moves back to his side of the bed. “There, like all married couples. The old ball and chain is irritated with me over nothing.”
It is absurdly satisfying to shove Sukuna bodily out of bed. Out of everything between them, Yuuji’s physically stronger. It’s all she’s got, and she abuses it. He hits the floor with a good grunt, and Yuuji snuggles back into bed, content.
Sukuna lets her have her peace until he’s back in bed, cold hands tickling her until she cries for mercy.
It’ll be fine.
They’re close, a few pecks on the cheek won’t hurt.
So Yuuji adds kisses to their routine; wake up, resist the urge to pinch Sukuna’s nose shut, if he’s still sleeping, to force him up. Wake up Nobara, wake up Megumi, go back into Nobara’s room and make sure she’s actually getting up. Get them dressed. If Sukuna’s already awake, sprawled out on the living room floor like a king in repose, needling and testing for a weakness in the barrier, give him a kiss on the cheek or forehead, go make breakfast. If Sukuna isn’t awake, kiss his cheek when he comes down for food. Spend the day homeschooling Nobara and Megumi. They have their school books, and Yuuji and Sukuna are both amply qualified to teach them about sorcery.
Sukuna isn’t allowed to, because they’re already both menaces, and don’t need to be encouraged to find unhealthy ways to test their limitations.
Lunchtime. Snacktime. Playtime. Yuuji makes dinner and sets aside the leftovers for tomorrow’s meals. Sukuna can cook, and is actually quite good at it, considering he cooked for her when their grandfather was ill, and since then, his only friend’s hobby outside of fawning over him is cooking. Yuuji likes to cook though, so she banishes him.
His efforts are better spent trying to figure out how to get them out of the domain.
After dinner is family bonding time, except Yuuji and Sukuna didn’t agree that’s what they’d do. It just… sort of happens.
Yuuji’s been watching Nobara and Megumi for a couple years, and Sukuna’s been saying he hates kids and then stubbornly hanging around whenever she watches them, so they’re all used to one another.
Nobara and Megumi were both used to going home, where they’d be alone after spending all day with Yuuji.
Yuuji wonders, while Sukuna pretends to sleep on the floor, Nobara leaning against his stomach like he’s a body pillow while she plays Kirby, how hard it is going to be to go back to normal.
Megumi watches Nobara play, or he reads, or he draws. He’s very independent, which only makes him cuter, in Yuuji’s opinion. He’s free to go where he likes in the house, because he can be trusted not to play with the meat tenderiser, but he doesn’t leave. He stays, like a little shadow, sitting with Yuuji at the kotatsu, or behind Sukuna’s knees, or on the couch, watching over them like a solemn guardian.
Bathtime. Bedtime. Rinse, repeat.
Yuuji kisses Sukuna on the cheek before they go to sleep.
She tries not to wonder if she’s allowed to kiss his neck so he doesn’t have to lean down. She doesn’t ask, but sometimes she dodges him, and kisses his forehead when they’re in bed, while he watches her, acting like he doesn’t hate the change in the routine.
A little over a week, and it’s a routine.
Megumi and Nobara are happy. They try to wheedle to stay up past bedtime to sit in silence, while falling asleep on the floor with Sukuna. Yuuji caves, and Sukuna’s stuck lugging unconscious children to their beds like sacks of potatoes.
They beg Yuuji to teach them how to make dumplings, proudly showing off their misshapen and uneven creations to Sukuna while the awful perfectionist sneers.
He eats them anyway, and twirls Yuuji’s ponytail around his fingers while Nobara and Megumi argue about whether or not they should tell the curse to make them a cat or a dog.
This is wrong, Yuuji thinks, balancing an overstuffed dumpling on her chopsticks, the seam too long, and shaped like cat ears. Nobara’s.
“We have two dogs, brats. Megumi, you should practise summoning the Divine Dogs more often,” Sukuna interrupts, watching the two children dispassionately.
His fingers are still twirling in Yuuji’s hair, and he isn’t even watching her. Assured in her presence.
Yuuji’s happy.
She wants to kiss him, not on the cheek. She wonders if this is how the curse wins. She shouldn’t want to kiss her older brother. She shouldn’t worry about going back to normal. She shouldn’t dread getting out.
But she does. Yuuji doesn’t want to go.
When she gets out of the shower that night, ‘More’ is written on the mirror. She sighs, and throws on her robe. She leaves the bathroom, cracks the door to their bedroom. “Hey, nii-chan?”
Sukuna looks up from where he’s got graph paper spread on the floor, drawing out a precise layout of the house as a domain, including where the barrier runs strongest and weakest, like the insane person he is. “Where’re your clothes?”
“Mirror’s haunted, and it thinks we’re basic.” Yuuji pushes the door all the way open and goes back to the bathroom.
As she guessed he would, Sukuna follows, leaning in the doorway as the steam clears and the words fade from the glass.
“Fuck.” Sukuna says.
“Yeah.” Yuuji agrees.
Sukuna pushes off the doorframe, and closes it behind him when he walks away. Yuuji bites her lip, hard, and sits on the toilet with her head in her hands. Was this somehow her fault? Did she make the curse more powerful?
She takes a deep breath, and gets up, gets into her pyjamas.
She punches the mirror, and knows it’ll be fixed by the next morning. It takes her a bit of extra time to clean the glass out of her knuckles, and the blood off the counter. Selfishly, she hopes when she gets back to their room, the lights will be off, and Sukuna will be brooding, turning the whole domain over in his mind, ignoring Yuuji.
Maybe he’ll even find some way for them to get out by morning.
Yuuji hopes he’ll find some way to get them out, and she can pretend she doesn’t feel this way. She doesn’t like feeling this way.
When Yuuji gets back into their room, the lights are out, and she relaxes, crawling into her side of the bed, ready to turn her back on Sukuna and go to sleep.
“Yuu-chan,” Sukuna’s facing her. She can tell from how he sounds in the dark. She stays stubbornly on her side, back toward him.
“Brat, you literally just got in bed, you can’t pretend you’re sleeping.” Sukuna grabs her shoulder, and Yuuji slaps him off.
“No, I’m not pretending to sleep, I’m ignoring you,” Yuuji says, despite knowing better than to needle her control freak of an older brother.
Sukuna sucks his teeth and grabs her, dragging her to the middle of the bed. “Don’t be a little shit, you know I’m not thrilled about this either,” He snaps. The white of his canines, the pointed fangs they share, is bright in the false moonlight that creeps into their room.
The weather is the same, every day. Cheery, sunny. The night is always just cool enough that Yuuji feels the needle to cuddle. The crescent moon makes the darkness deep and comfortable.
Now her stomach twists with anticipation, and she nearly holds her breath.
“We’ll talk about it in the morning,” She says, trying to turn away from him again.
Yuuji’s desperately and woefully unprepared for when Sukuna says; “Hey, goodnight kiss. Even if you’re pissed off, remember?”
The anticipation curls into a low heat of arousal, and Yuuji caves, because she’s weak. She wants to touch him. She wants Sukuna to fix this so she doesn’t have to feel like this for him.
Yuuji twists and wraps her arms around his neck, snuggling into him so they lay chest to chest. Sukuna makes an inquisitive noise. “You aren’t pissed? Make up your fucking mind, brat.”
“I’m sorry,” Yuuji says into his neck, and tries not to think of how much she wants to kiss it.
Sukuna pillows her head on his arm, curling it under the pillow to support them both. His other arm flops over her waist, loose. He’s heavy.
“You better be, making me do all the work figuring this shit out,” Sukuna says, without any heat. “I know you’re spoiled, but damn.”
More.
Yuuji isn’t really listening to Sukuna, or his bitching. She knows he doesn’t mean it, he’s just functionally incapable of empathy. She presses her lips to his neck, a dry peck, there and gone, too scared of herself to consider it for too long.
Sukuna goes quiet.
He sighs. “Yeah. We’ll. Mouth.” It sounds a bit like his brain broke.
Yuuji tries to hold in her laugh, but she snorts really unattractively instead.
Sukuna pinches her side with a mean giggle. “Karma, piglet. Let me be awkward about having to kiss my fucking sister on the goddamn mouth.”
Yuuji can’t. If he kisses her, she’ll moan. “In the morning.” She corrects.
“In the morning.” Sukuna agrees, and Yuuji feels him relax, not having noticed how tense he was.
Of course he would be. What sort of person gets excited about kissing their sibling?
Sukuna knows himself. He knows his flaws; he bores easily, he’d rather a good drink, a good fuck, a good meal or a good fight over most things. He’s also aware of what others, specifically his sister, think of as his flaws; selfish, controlling, obsessive in his passions, jealous, cruel.
She’s not wrong, he just doesn’t think they’re flaws.
The issue is that he didn’t know, until soft lips pressed into his neck, that his flaws included wanting to kiss the aforementioned sister. Is he the sort of person who gets off on kissing his sibling?
In the defence of incest, Mei Mei is one of the few sorcerers he can tolerate, and whatever she has going on with her brother is weird, and kind of hot, in Sukuna’s opinion. But Sukuna? And Yuuji?
Yuuji sleeps on his arm, dead to the world and drooling like the cave troll she is.
Ui Ui only uses his techniques when Mei Mei gives him permission to, a self-imposed vow. Sukuna stares at Yuuji’s dumb expression and wonders what it would be like if she did the same; if she limited herself to only unleashing her dogged focus, the violent crush of her fists, to when Sukuna permits her to.
His dick twitches.
Sukuna pinches the bridge of his nose, and adds ‘unhealthy interest in younger sister’ to his list of flaws.
He can’t even make the argument that it’s because he hasn’t been able to jerk off, because he has, years of living with either a clingy younger sibling or in a dorm with Gojo fucking Satoru has made him very skilled at getting off quickly and quietly.
So, Sukuna not only wants to kiss his sister, but has to kiss his sister.
The parts of him that he rarely entertains, the parts fueled by his ravenous appetites that cries for more, more, more aches. Sukuna stills his mind. He’ll ignore it, for Yuuji, like he always does.
He could have the world, except for her, always held back by useless compassion.
… But what if he could have them both?
Sukuna sleeps and dreams of a world where his power is unchecked, a well loved fantasy, but eyes the addition of two small children and a queen who shares his blood with dispassionate interest.
A nice dream, to be sure, but one impossible because of fucking Gojo , and fucking Geto . In a world where he’d been born without them? Maybe.
Sukuna wakes up alone, and makes the choice to laze through breakfast.
It works perfectly until Nobara comes barreling into bed with him, her little gremlin voice shrieking with uncontainable glee. “What burned?” Sukuna asks, staring at the ceiling.
Nobara ragdolls against him, and he hears Yuuji making chastising noises in the hallway. “Nothing,” She’s carrying something.
Uhg. What’d she bring into the bed. Sukuna glances down at her, and she proudly presents a stuffed pink tiger. “It’s you.” She says.
The fucking tiger has his tattoos in its stripes.
This curse is not funny.
“Where’d you get that?” Sukuna asks, sitting up.
Nobara looks smug. “I asked the curse for a cat, because Megumi gets a dog, and it’s not fair.”
Sukuna can respect the pettiness. He nods, pats her head. “Not bad, brat.”
Nobara grins up at him, pleased, as Yuuji comes in, carrying another stuffed pink tiger under her arm. It’s smaller, but has embroidered patches to match the scars on her face.
“Don’t encourage her to ask the curse for stuff,” Yuuji grumbles, and grabs Nobara by the leg, pulling her from the bed while the imp shrieks and laughs.
Sukuna shrugs, watching them.
Nobara takes the other tiger from Yuuji, “Back downstairs, we’re going to study outside today, okay?” Yuuji says, setting Nobara on her feet.
Nobara huffs, rolling her eyes in a clear imitation of Sukuna. Sukuna doesn’t try to hide his nasty smirk. “Fiiiiiine.” She drags her feet as she goes, a stuffed tiger under each arm.
Sukuna wants .
Yuuji turns to follow her.
Sukuna whistles sharply, like he’s calling a dog to heel, and it has the intended effect.
Yuuji stops dead, her head creaking toward him.
Okay, probably not his best laid plan. Sukuna pops a knee up, rests his elbow on it, crooks his finger at Yuuji. It’s just a kiss. A peck on the lips. If he’s resisted killing fucking Gojo for this long, Sukuna can resist taking more from Yuuji than she has to give.
“What do you want.” Yuuji stomps over to him, and okay, definitely should not have whistled at her like a dog.
His brat’s too damn proud.
Sukuna swallows the urge to click his tongue, because while he loves a fight, Yuuji will absolutely break something of his and he doesn’t feel like dealing with the repercussions of domestic violence in this domain.
“You know the routine,” Sukuna says, and means, kiss me, like I want you to.
He watches as Yuuji thinks about being bratty, but her irritation melts away, and she sits on the edge of the bed, facing him. “You’re sure?” She asks, eyebrows furrowed.
She looks scared, and hurt.
Sukuna’s going to rip this curse to bits, without his technique. He wants to see it suffer, for doing this to her. He can’t take any more from her. “Yeah, just a peck. No different than when we were kids.”
Yuuji snorts at that, and says, “You’re bigger than that beetle.”
But she leans in and brushes her lips over his, and is gone before he can react. That’s for the best. Sukuna closes his eyes, and readjusts his expectations on how casually he can approach this.
Just a brush of lips, and he nearly chases her. Alright. No more letting Yuuji initiate, Sukuna needs to control this, or it won’t be controlled at all. He loves making her cry, but that hinges on his ability to keep talking to her, and her not disowning him for shoving his tongue down her throat.
This is something within his capabilities. He lazes about a bit longer before going back to finishing his design of the domain. Once he knows its dimensions, he can start to break down how the cursed energy flows, and start breaking down what, exactly, the curse is feeding on.
Clearly, he should ask the damn thing for police reports on how the other families died. Somehow, he doesn’t think it’ll be that easy.
He watches Yuuji and the goblins play with Megumi’s shikigami for a bit through the patio doors, once he goes downstairs, before settling in his customary laze to sort through what scattered bits he remembers from the newspapers he didn’t read, and the TV reports he barely paid attention to.
In the evening, Sukuna knows he can’t kiss Yuuji in their bed, so he catches her by the arms, and leans down to kiss her chastely, brows furrowed. He’s holding her too tightly, and the gremlins are right there, waiting for the two of them to sit for dinner, but Sukuna has to get this out of the way.
It’s awkward. It’s not a good kiss. Yuuji stands stock still, and Sukuna only presses his lips against hers once before pulling his face away. He thinks about kissing her again, and again, until they get it right.
Yuuji winces. “You’re hurting my arms, ‘Kuna,” her voice is only loud enough for him to hear.
Sukuna lets go of her arms. “Thanks, babe.” He says, loud enough for the kids and the curse to hear before turning to sit at the kotatsu, pushing his bowl over toward Nobara so she can pick the water chestnuts out of his steamed vegetables for herself.
He licks his lips before Yuuji comes around to sit with them, admonishing them for starting to eat without her, and praising Megumi for his patience.
It’ll be fine.
So they change their routine, and Sukuna’s glad Yuuji doesn’t ask him why. In the mornings, he catches her shoulders, and holds her still, gives her a peck, and goes on his merry way to whittle away the hours. He doesn’t care if the kids are there or not.
Every evening, they’re definitely there, when Sukuna kisses Yuuji before dinner, or while she’s cooking, holding her still, turning her toward him, curling over her and ignoring the urge to fix how awkward these kisses are.
The kids watch, and they stop calling him his name entirely.
It takes four days before Megumi catches Sukuna swearing, and says, “I’ll think you’re my real dad like that,” matter of fact.
Sukuna knows that Fushiguro Toji is dead, and cannot stop him if Sukuna wants to be Megumi’s father. Fucking Gojo might have an opinion, but Sukuna’s never cared for any of his opinions anyway. They’ll have to get Megumi’s sister, once they’re out of the domain.
Sukuna wants that.
It’ll be fine, Sukuna makes more than enough money just by existing as a special grade. The thought gives him pause. How long have they been gone? While fucking Gojo is unreliable, and has forgotten Megumi with Yuuji before, Geto actually likes children, and keeps good track of where the Fushiguros are, always punctual in fetching them and bringing them home in all the ways fucking Gojo isn’t.
A curse like this would be nothing for either of them to invade the domain of, but they haven’t.
Sukuna makes a habit of getting up before Yuuji, and going downstairs to lounge, waiting patiently for her to herd the ducklings down for breakfast.
He watches their heads pass through the door frame, and calculates while he gets up to follow Yuuji into the kitchen, intending to hold her still and get their morning obligation out of the way.
She’s washing lettuce in the sink when he gets to her, the goblins eating cereal. It’s nice the curse does groceries for them, at the very least.
When Sukuna turns Yuuji, her hands come up to his cheeks, and she holds his face like she’s afraid he’ll break. Sukuna freezes, eyes wide, hands curled on her shoulders while she closes her eyes, and gives him a shy kiss.
She stays long enough for him to kiss her back, closed mouthed and sweet, before she pulls back. When her eyes open, she’s staring at Sukuna like she’s the one who’s lost control, ruled by a hunger that can never be sated.
Sukuna leans, intending to kiss her again, and Nobara whines about how gross they are. The moment is lost, and Sukuna leans back, licking his lips thoughtlessly. Yuuji watches him like he struck her.
Huh.
They both want this.
That’s bad.
Sukuna turns and rubs his knuckles into Nobara’s head. “Don’t be rude to your parents,” he says.
He’s not sure if she is condemning them for being kissing siblings or not.
Nobara scrunches her nose. “My parents should kiss in private. Yuck.”
Typical gremlin behaviour.
Sukuna leaves the room, letting Yuuji go back to playing mommy. It suits her.
Because he is magnanimous, Sukuna makes a show of not kissing Yuuji during dinner, and tries not to focus too hard on how obviously disappointed she is. She puts a movie on for the brats after dinner, and goes to do laundry.
He follows on silent feet.
He corners her against the machines.
Sukuna presses his palms to the washing machine, leaning down to her to press closed mouth kisses to her lips while her hands rest feather light on his chest.
“Nii-chan,” Her voice is quiet, and this is too far. They have the light off in the kitchen, the only illumination is the TV in the other room. Her lips are pink, and Sukuna wants to bite them.
He leans away, well aware he’s the one who started this. “We should stop,” he says.
Yuuji nods, swallowing.
She doesn’t look like she wants to stop.
Sukuna collects his tattered self-control and steps away.
They still cuddle in bed. He thinks about kissing her until she falls asleep, or he does. Sukuna doesn’t act on his fantasies, and forces himself to stay awake more often than not, so as to avoid any potentially escalating dreams.
He isn’t perfect, and falls asleep on occasion, generally when he doesn’t sleep during the day as much. Yuuji starts waking him with kisses. They’re never too much, or too far, just soft lips pressing against his, tantalisingly sweet against his own until he can’t help but taste them on his tongue.
Their kisses stop being chaste with Yuuji holding his face, leaning over him with her hair down, in an oversized shirt that might actually be his, shyly chasing his tongue with hers. It should be disgusting, they both just woke up. It isn’t.
Sukuna wants to kiss her more than anyone he’s ever been with. He doesn’t want to get up, he just wants to hold her down and kiss her until she can’t remember anyone but him. A thought strikes him.
“Yuuji,” He pulls back, and she tries to follow, sucking on his lip, bright eyes half lidded. “Hey, cut that out for a second,” Sukuna catches her by the face and holds her still.
She pouts, obviously put out that he stopped her. “What.”
“Have you kissed anyone else? Nanami?” Sukuna doesn’t know why he’s asking. He hates acknowledging that his sister is hot, and irresistible to bastards, clearly himself included. The alternative, however, is that he’s her first kiss…
“Nanamin? No,” Yuuji trails off, and she swallows. She looks away and starts to move off of Sukuna.
The desire to bully her strikes, like lightning, unforgiving and all consuming. Sukuna laughs, delighted, and catches Yuuji, flipping them. She hasn’t kissed anyone else, “Is it me?” He asks, dodging her flying hands as she tries to shove him off. “Your first kiss?”
“Shut up!” Yuuji slaps at his shoulders, but if she really wanted him gone, he would be.
“It is me,” Sukuna croons, pinching her cheek as he balances his weight on one hand.
No one but him has kissed his sister.
It fills Sukuna with a foul pride, and he thinks he likes Mei Mei a bit more after this experience. At the very least, he definitely understands the appeal, and in hindsight, he should have examined why he thought Mei Mei’s relationship with her brother was hot.
He leans down again, his pinch smoothing to cup Yuuji’s cheek when the door bursts open.
“We’re hungry - blech! Gross!” Nobara gags.
Sukuna drops his forehead to Yuuji’s. “Fucking kids.”
Yuuji laughs, her face scarlet. “Get off me, I have to get breakfast.”
Sukuna grunts. “I’ll do it.”
Yuuji looks startled, and Sukuna doesn’t want to get up. He wants to keep kissing his sweet little sister until her lips are red and swollen.
Her first kiss was him.
Uhg. It sucked. It was an objectively terrible kiss. Sukuna is better than that.
Sukuna forces himself out of bed before he can dwell on that any further, forcing himself to be content with what he has. Kissing Yuuji is one thing, and clearly, the curse agrees, because it hasn’t cosplayed the Ring Girl recently in the windows. There’s no need to go further.
Sukuna herds Megumi and Nobara downstairs and watches as they pass through the door, his eyes on the frame.
It’s like he thought.
Neither of them have grown, despite how much time has passed.
Sukuna grins, and makes breakfast, content in the knowledge that this has become a waiting game. They play until the curse can’t keep the domain up; or until someone comes to get the goblins in the real world.
The real challenge will be not to take any more of Yuuji’s firsts.
Sukuna’s sick with the want for it.
Yuuji can’t stop.
Having Nobara and Megumi catch them is starting to get embarrassing, so she waits, but the second they’re in bed, sleeping, she’s on Sukuna, kissing him.
She loves it, everything about it. If he’s surprised by her initiative, he doesn’t show it anymore, doesn’t hold her in a death grip to keep her still. Instead, he lets her go to him, stretching out in his favourite spot on the floor, or on the couch, or in their bed.
He grins, like an asshole, everytime Yuuji snuggles up to him, and starts peppering featherlight kisses against his lips, still too shy to outright ask for what she wants.
Which is understandable, because what she wants is more than kissing.
Sukuna lets her lead, lets her initiate, and that’s somehow worse, because then it’s because of her. She’s the one who sucks on his tongue, who pants into his mouth, who wraps her arms around his neck, and pulls herself closer and closer.
It makes her so, so, wet.
She wants to sit in his lap while they kiss, wants him to touch her tits, or her ass, or anything more than the loose (possessive) curl of his arm around her waist, his hand tilting her chin back when he leans over her. She wants him to crawl on top of her again, but he never does.
It’s all so overwhelming.
He is her first kiss, and she wants him to be her first everything.
In hindsight, she’s probably always wanted this, but couldn’t recognise it. She had the chance for boyfriends, and girlfriends, but she always rejected them (after deep contemplation on occasion) because she didn’t think they’d measure up to Sukuna.
At the time, she’d been thinking of it literally; had questioned if he’d at the very least tolerate them, or if he’d just cut them up, but looking back on it, she was comparing. She was measuring every person who’d expressed interest in her to him, and found them all wanting.
She wants him to have her first everything.
Yuuji loves him, and it’s definitely not the way she should love her brother. So she kisses him, and her cunt aches, and her fingers twitch, either with the need to touch herself or touch him.
Everytime she tries, shaking hands slipping from his neck, or his shoulders, to smooth down over his chest, Sukuna catches her wrists, and sends her to bed, or gets up in the mornings.
Yuuji listens, every time, because he’s right, but her cunt really hates it. She can barely get in the shower before she’s slipping her fingers into herself, biting her lips to stifle the way she wants to cry out his name while she circles her clit with desperate fingers.
His hands are so much bigger than hers, rough in the same way from the violence of their lives, and it would feel so, so, good to shake apart on them.
Yuuji cums desperately quickly when she thinks of Sukuna’s fingers inside the heat of her, rather than her own, and doesn’t even try to fantasise about anything else.
One night, when she crawls into bed, still flushed and loose from her orgasm, Sukuna glances at her, and grins.
“Feeling okay?” He asks, like an asshole.
Yuuji feels the way wetness immediately begins to soak into her previously clean panties. The irritation, oddly, only makes her want him more.
What would it be like if he put his mouth to better use between her legs?
Yuuji swallows, and gets under the blankets with him, shuffling closer until she can wrap her arms around his neck, tilting her face up and hoping he’ll kiss her again.
He already sent her off once today.
She’s pushing her luck.
He’s watching her like she’s pushing her luck.
But Sukuna traces fingers up the side of Yuuji’s neck, and tangles them into her hair, still warm from being blow dried. She shivers, her eyes falling half closed.
“Yuu-chan,” Sukuna’s not kissing her, he’s talking to her. Which is not what she wants at all. So Yuuji kisses him, trying not to wrap her legs around him when he groans into her mouth, tilting her head with the hand on the back of her neck.
Yuuji pushes closer, until her breasts brush up against him. Her nipples peak under the shirt she stole from him, the thin material only dampening the sensation enough to tease her.
“Brat,” Sukuna pulls back, “I’m trying to talk to you. Gimme a damn minute, woman.”
Yuuji leans back, and tries not to be too put out. “Fine.”
“Time isn’t passing in here,” Sukuna says, and Yuuji’s lust clouded mind clears with the reminder, that, oh, right, they’re trapped in a curse’s domain, and if they fuck up, Megumi and Nobara will die.
Yuuji moves her hands into Sukuna’s hair, and grabs it, pulling slightly to express her annoyance. “Why didn’t you tell me earlier?!” She hisses.
Sukuna’s face is red, and his eyes are closed, lips parted. “You need to stop doing that, right now.” he breathes out.
Yuuji wants to tug on his hair until he fucks her stupid, until she can’t recognise where her role as sister ends and where her role as wife begins.
She pulls her hands away as if burned, blushing to the tips of her ears, chastised, and scared of herself. “Sorry.”
Sukuna hums, and leans forward to kiss her again, slow in how he moves his lips over hers, sucking and nipping until pressing his tongue in like they have all the time in the world.
When he pulls back, he presses their foreheads together, and then kisses the tip of her nose. “Don’t do that again.”
It isn’t fair. Yuuji fingered herself so she wouldn’t have to lay in bed with him, aching to feel him inside her, and here she is, practically incoherent with the need to cum, just from kissing.
“What’s happening then? If time isn’t passing? It feels like it’s been so long.” Yuuji doesn’t know what to do with her hands.
She wants to put them up his shirt and touch his nipples, pinch at them, grab at his hips and waist. She settles for pulling her arms back and petting her hands along the sides of his neck to his jaw, cupping his face. She needs to touch him as much as she needs him to touch her.
They need to stop, this is going too far.
Sukuna’s thumb strokes behind her ear, and he holds very still, watching her in the dark. “Time’s passing. It’ll either run out of energy, and the domain will drop, or someone will come looking for the gremlins.”
“Oh,” Yuuji can’t help it, her expression falls.
She doesn’t want to give Nobara and Megumi back to their respective guardians.
Leaving here also means she has no excuse to kiss Sukuna.
Sukuna moves her, guiding her with the hand on her nape so she lays on her back, perching above her on elbows and knees as he kisses her.
Yuuji clings, sighing into his mouth while she rubs her thighs together. There’s no way he doesn’t know what she’s doing, but she doesn’t care. He’s going to stop and she’s going to have to sleep in bed with him with a weeping, aching cunt, and it’s his fault.
“Suku-nii, it’s not fair,” Yuuji pants out between kisses, and she’s not sure if she’s talking about them, or if she’s talking about the impending loss of their little family.
She wants a real family so badly, and hadn’t even known until this stupid curse interfered. Yuuji could have lived in ignorance, blissfully unaware of how badly she wants to be a mom. Of how badly she wants to be Sukuna’s wife.
Sukuna pulls back, resting his forehead against hers. His gaze trains downward before he lifts his head, and kisses her on the cheek like he’s exhausted. “Bedtime, Yuu-chan.” He says, rolling off of her.
Yuuji can’t help herself, and looks down.
He’s hard, clearly outlined against the loose white sleeping pants he’s wearing.
The guilt that hits Yuuji is indescribable, rivalled in intensity only by her arousal. She doesn’t stop him, and rolls with her back to him, tucking up in a ball. She shoves her wrist between her legs, and clamps her thighs around them, turning her face into her pillow. Yuuji refuses to grind her hips into her own arm, but the pressure is there just to take the edge off.
Or to tease herself.
Both are possible.
When she finally falls asleep, she doesn’t sleep well, plagued by dreams of her brother fucking her all over their fake house.
She wakes up moaning his name, his arm heavy around her stomach and his face buried in her neck.
Yuuji flinches, and Sukuna nuzzles closer.
Her body flushes hot to cold. He knows. He was awake and she was having sex dreams about him.
Sukuna mouths at her neck, and Yuuji squeaks. “Gotta problem, Yuuji.” He sounds pissed.
Yuuji bites her lip, and sniffles. This is it. This is the part where he disowns her for how disgusting she is.
Sukuna’s head rockets up from her neck, “Huh? You’re crying? Fuck, babe - Yuuji - I’m, shit. I wasn’t - I didn’t -” he pulls back from her, recoiling and unsure in a way she’s never seen him be.
Generally speaking, when she cries, and it’s because of him, he grabs her face and laughs at her, tries to rub in whatever she’s upset about, because he’s really good at non-toxic communication and affection.
His retreat prompts Yuuji’s sniffles into full blown sobs that she tries to contain.
He groans, loudly, the same sort of sound he made when she was kissing him the night before, and suddenly he’s back on her, rolling her onto her back, trying to pry her hands from her face. “C’mon, just a peek, Yuu-chan, then tell me what you’re crying about.”
There it is. Psychopath.
It’s familiar enough that irritation wins out, and Yuuji starts shoving at him, trying to swallow back her tears. She just ends up angry crying instead, with a too clingy brother trying to pin her wrists so he can watch, and cackle.
“I’m sorry! Okay! And you’re being a freak!” She kicks at his legs, and hopes she leaves a bruise.
Sukuna stops laughing for a moment, and cocks his head, like a confused dog.
It’s cute. His hair is all fluffed up from sleeping, and he hasn’t had the chance to push it back from his face yet.
“What are you apologising for?” Sukuna asks.
Yuuji stops struggling, and sniffs. She tugs on her arm experimentally where he has her wrists pinned above her head. Her face is sticky and disgusting, and she wants to get a tissue and clean herself up. Tears slowly roll down her cheeks every time she blinks. “The problem - I’m sorry, I can’t…”
Sukuna makes a sudden sound of realisation and pins her wrists above her harder. “Eh, no. You didn’t let me finish before you started bawling.”
She kicks him again.
Sukuna rolls his shoulders, sighing like he liked that. Knowing him, the freak of nature, he probably did. “Look at the window, crybaby.”
Yuuji kicks him again, and his groan doesn’t sound pained.
She looks at the window. ‘ More, or they die tonight.’ Has been etched into the glass.
More would be…
More is exactly what Yuuji wants.
She looks up at Sukuna, eyes wide.
“Yuu-chan, you like lame shit, did you read about any of the deaths in the neighbourhood?” Sukuna asks, instead of pulling her shorts off and fucking her stupid.
Yuuji closes her eyes, and whines, shoulders shaking at the now petulant tears dripping into her ears. She doesn’t want to talk about the curse’s kill count, she wants Sukuna to bury his tongue between her legs until she can’t breathe.
Sukuna licks her cheek, tasting her tears, moaning low in his throat. “You look so… Fuck, this is…”
“We can’t do this,” Sukuna says as he nuzzles her cheek, and curls his tongue into her ear before sucking on her earlobe.
“We can’t do this, he says,” Yuuji pants, “and sucks on my ear.” It’s not fair of him. He’s holding her down, and he could do whatever he wants, but he isn’t doing anything.
Yuuji glances down, transfixed by the tent between Sukuna’s thighs, the way his cock is hard and pointing straight at her.
Okay, no more patience, no more good little sister. “Is the door locked?” Yuuji asks.
“No, they’re sleeping and won’t wake up, that’s why I’m asking -” Sukuna’s cut off when Yuuji flips them and seats herself directly on his cock, hot and hard against her cunt through their clothes.
Sukuna pants, and grabs her hips. “Clothes stay on.” He says, a vein throbbing in his forehead. His hands hurt where they’re grabbing her.
Yuuji doesn’t need more of an okay than that, and starts dragging her hips over his, throwing her head back with a gasp, grinding down as hard as she can. They’re wearing too much clothes, but Sukuna’s hissing, and bucking his hips up against hers.
“It can’t kill them if we do this, right?” She asks, shaking her hair out of her face where it’s starting to stick in her mouth.
Sukuna arches up under her, little jerks up his hips like he’s trying to set the rhythm. His eyes are locked on where her face is still wet with tears, eyes black like he’s drunk on the sight of it.
Yuuji, who has no idea what to do except chase what feels good, tries to mimic the twitches of Sukuna’s hips against hers, and finds the angle to grind him against her.
There’s too much clothes in the way.
Yuuji still might cum anyway, wanting to arch and preen under Sukuna’s attention. He likes her crying? She’s so desperate she feels like she could cry, so she lets go, jerking her hips faster to grind her clit on him, and sobs.
Sukuna takes over guiding their rhythm, heavy handed and pulling too hard. It hurts, and he drags her over the head of his cock firmly enough that she feels him press against the looseness of her entrance through their clothes before he drags her down.
The pressure is too much, and Yuuji keeps crying as her legs start to shake and twitch, overwhelmed and on the edge, but not getting enough to tip her over.
She’s so empty.
“Please, Suku-nii, I need more, I need more,” She sobs, barely hearing what she’s saying over the rush of blood in her ears.
She can feel her walls pulsing, longing to have something to squeeze and rock inside. Yuuji wants him to cum in her, to split her open on the length of his cock, instead of teasing her with it.
Sukuna moans and lets go of one hip so he can grab her face, brushing his thumb hard under her eye to catch tears and bring them down to his mouth.
Yuuji chases his hand, and kisses him, sloppy and wet, while their hips grind. When she pulls back, a strand of saliva connects their tongues.
“Please, please, I wanna play for real,” Yuuji begs.
Sukuna blinks like he’s coming out of a trance. “What? Yuu,” his tone is warning, but Yuuji can feel him throbbing between her thighs.
“Just, put it in. We don’t have to move, I’ll be good, I promise, I just need you inside.” Yuuji can’t stop moving on him, and she’s soaked through her panties and her shorts. All they need to do is pull the sodden fabric aside, and he can make her perfect.
Sukuna tears his eyes away from her face to look between them, panting. He doesn’t say no, just watches the way her pussy grinds against his cock, wetness moulding her clothing to her.
His hand slides to grip her ass, squeezing.
Yuuji can’t stand it.
She pulls her hips off of his, sitting up on her knees, expecting him to stop her. His hands join hers, encouraging, pulling his shirt up, his pants down, and his cock out to stand full and red below her cunt.
If she was in a better mindset, and not blinded by lust for her brother, she would question his choice of going commando when they’ve been forced to play house.
As she’s not in a better mindset, she pulls her shorts and panties to the side, and rubs herself against his cock. It feels better than it has any right to, hot, and slick, and all Sukuna.
“Just the tip,” Sukuna says, holding himself steady, rubbing his slit against her.
Yuuji shimmies until she feels him line up properly, and she sits down slow, the even pressure letting him sink into her, blunt head spreading her open. She feels when the glans pops in, torturous relief from where it was spreading her open.
Sukuna’s gritting his teeth, his head thrown back and throat working to swallow down moans. Yuuji stares at him, face hot and body tingling all over.
She lowers herself onto him, and Sukuna’s eyes open, those moans punching out of his throat as Yuuji takes all of him inside, until her lips squish against his pelvis.
He feels so good inside her, and Yuuji knows if she swivels her hips just right, he’ll grind against her perfectly. It was better when his cockhead dragged over the most sensitive parts of her walls, but just the fact that it’s him, that he’s all the way in, is good enough.
Deliriously, Yuuji wonders if he came right now, if he would impregnate her. Her whole body throbs, and she clenches tighter, relishing every inch of him where her body grips him.
“F-fuck, Yuu-chan,” Sukuna pushes himself up on his elbows, and doesn’t throw her off. “You’re so, you feel so -” He can’t seem to get the words out, and his thighs tremble, like he’s trying not to buck into her.
Yuuji leans down to kiss him again, and the way his cock shifts in her has her seeing stars, leaking all over him. “I’m glad,” Yuuji wraps her arms around his neck, interspersing her breathing with kisses to his mouth, his chin, his cheeks. “Oh, I, I, wanted this to be you.”
Her first. Sukuna. First crush, first kiss, first fuck.
Sukuna shoves his hands up her shirt, his hands in a death grip on her waist. To hold her still, she thinks.
That’s not happening.
Yuuji rolls her hips, trying to work out how best to get herself off on him. She sneaks a hand down into her shorts to rub her clit as she moves, and is rewarded when the muscles in Sukuna’s arms flex, and then he drags her back down in himself, hips slapping upward.
Yuuji pants out a litany of, “Yes,” and “More,” the wet sounds of their bodies meeting steadily being drowned out by their moaning.
It doesn’t take long until they find the perfect rhythm, Yuuji’s body singing on a tightwire of pleasure, steady and consistently pushing her toward the edge, Sukuna’s cock stroking over where she’s most sensitive.
“I’m gonna cum,” She pants into his throat, single minded in her pursuit of pleasure.
“Fuck, Yuuji, I’ll, lemme pull out,” Sukuna’s under her, and short of throwing her off, he can’t if she doesn’t want him to.
He’ll cum inside her if she doesn’t move. She’s not on birth control. They’re not using a condom.
Yuuji’s eyes flutter shut, her legs spasming involuntarily as she clamps down on him, walls convulsing and trying to draw him in deeper as she takes all of him as her orgasm hits her. “Wanna, I wanna, please I wanna have a baby.”
Oops.
Wasn’t supposed to say that.
Sukuna whines, and he arches his back. Yuuji can feel him throbbing in her as he cums inside her, staring at her like he’s enraptured.
Yuuji twitches with the aftershock of her orgasm, the wet feel of him inside her too much. A few more tears come to her eyes, and the ringing in her ears starts to quiet.
When Yuuji tries to pull off, quaking, Sukuna’s hards clamp hard enough to bruise where they’re still on her waist, and he flips them. He’s softening in her, and their mixed fluids are starting to drip out, but he’s still inside.
Yuuji mewls, and Sukuna cuts it off by sealing his mouth over hers, biting at her lip and tongue.
Yuuji drags her head away, presses her cheek into the bed and sobs once more. It hurts as good as it feels, and Sukuna chases her tears like ambrosia.
“You want to have my fucking baby, Yuuji?” He sounds like he doesn’t know if he’s pissed or excited.
Yuuji doesn’t know if she’s scared or euphoric, so they’re even. She nods, desperately. “I really wanna be a mom,” she admits in a rush. “I realised when we were playing and Megumi called me mom for the first time…”
Sukuna opens his mouth and they both hear a door open, followed shortly by Nobara screaming “Mom!” At the top of her lungs.
Sukuna pulls out, and Yuuji feels the elastic snap of their fluids on her sensitive cunt when he does. He yanks her panties and shorts back in place, and grabs her, hard. His fingers sink in, just a bit, through her clothes.
Yuuji’s dizzy, her legs spreading wider with a whine.
“And look, curse is happy, mommy’s happy, and I’m going to blow your fucking back out when they’re in bed, understand? You’re mine.” Sukuna bites her neck, hard, like he doesn’t know any other way to express his emotions.
In his defence, Yuuji knows he doesn’t, and that he resorts to violence when he can’t control how something makes him feel. She nods, and two sets of little feet pound down the hallway, Megumi’s voice joins Nobara’s in calling her name.
“When we get out, we’re adopting them,” Yuuji says, “Tsumiki too.”
Sukuna groans as he pulls away “I fucking hate kids,” he gripes.
“Not if they’re yours,” Yuuji sits up, and giggles when her older brother gives her a long-suffering look, but doesn’t argue, tucking himself back into his pants.
Yuuji’s sweaty, and there is a disgusting mess dripping into her panties between her legs when she goes out into the hall, catching two distressed children and comforting them, stroking soothing hands over their backs and cooing.
When Sukuna passes their little cuddle party, he pets them both on the head before heading to the shower, and they both begin to calm down enough to get a late start on their day.
Yuuji does not get to shower, but she does get to change, Sukuna taking over the morning routine, but both kids are too stressed by their nightmares from the curse’s sleep paralysis technique to be separated from them for long.
Yuuji lets them have a day off from studying and practising sorcery under the guise of taking it easy, but can’t deny her desire to relax is at least partially motivated by the soreness in her pussy, and the way Sukuna’s cum slowly drips out of her over the course of the morning.
It’s gross.
He watches her like he knows, and Yuuji feels hot all over.
He makes fun of her desperation in their bed that evening, mocking how she didn’t even clean herself up after putting the kids to sleep (with great patience and in the same bed, so they’d stop asking to sleep with her and Sukuna).
Sukuna fucks her anyway, turned onto her face, with her head held down in their pillows by a vicious hand in her hair, until Yuuji sobs apart on him, and he spills inside her. When he kisses the tears from her cheeks, he does so gently, checking her over for genuine injuries or displeasure from his rough treatment.
When Yuuji tells him she liked it, he sighs into her skin, curling around her like an overly affectionate boa constrictor, filling her with his fingers until she cries his name into his neck.
From that point on, for all intents and purposes, they’re husband and wife, as far as Sukuna’s concerned. The routines stay the same, and if Megumi or Nobara notice the change, or wonder if siblings are allowed to act the way that Sukuna and Yuuji do, they don’t say and they don’t ask.
The curse doesn’t escalate.
Instead, it begins to linger; watching in their window while Sukuna buries his head between Yuuji’s thighs, from the mirror while they lounge in the bath, his sister warming his cock like she was made for it.
It grows weaker.
It grows concerned.
Their yard with the swing and the lemon tree are the first things to disappear as the curse begins to struggle to hold its domain open. It cannot act, because they’ve fulfilled their part of its imposed vow; escalating until there were no lines in between them any longer.
The first mistake it makes, one shaggy hand reaching toward Yuuji’s hair as she passes by the kitchen window, is it’s last one. Yuuji catches it, and rips it inward, out of its safety outside the house’s limits, and into their grasp.
Its head flies clean off with a wave of Sukuna’s fingers, and its body collapses into a thousand neat cubes.
The domain begins to crumble, and once it clears, they’re in their apartment, Megumi and Nobara getting up from where their bodies have been asleep on the floor, with Yuuji. Sukuna’s still leaning against the wall where he was before this mess started, and now he has a flat beer, rather than a cold one.
It’s seven pm, still two hours from when Geto is supposed to come get the gremlins, and three hours have passed in the real world, one for each month in the domain.
It’s their real apartment, with only one floor, two bedrooms and a bathroom.
Nobara cries, because she no longer has her stuffed tigers.
Sukuna rolls his eyes, sucks his teeth, and promises to get her new ones if she shuts up, dumping his now disgusting beer to go and pick up Nobara, and then Megumi when he pretends he’s not jealous.
Yuuji stares up at him with parted lips from where she sits on the floor. He can practically hear her thousand questions, of ‘What now?’, so Sukuna walks away with the kids, toward his room. He’ll handle Geto , and then do something about Nobara’s grandmother.
Eh. If he tells the hag to jump, she damn well ask ‘how high’. If he wants her granddaughter, he’s getting her. End of story.
Sukuna dumps them in his bed, and flops in, taking his phone out to text Geto to bring Tsumiki and then go home instead of getting Megumi.
“I don’t wanna go,” Nobara’s lip is wobbling again, waterworks winding up.
“Tch,” Sukuna rolls his eyes. “You’re not, relax.”
“What about Tsumiki-chan?” Megumi asks, because he has missed his sister, in his quiet, kinda creepy kid way.
“Getting her too.” Sukuna sets his phone down when he sees Geto’s responses, first to agree, and then a question mark.
Not Sukuna’s problem.
Nobara smacks a small fist on his chest, and Yuuji follows them into his room, her arms crossed anxiously. Ah. Now that they’re out of the domain, she’s feeling guilty. Sukuna hopes she starts feeling pregnant instead, because it’s hot.
He’s seriously going to send Mei Mei a fruit basket, or something.
Fucking his sister is easily the best decision he’s ever made.
“I wanna stay forever! I like you and mom better!” Nobara insists, again. “I don’t wanna go back to granny!” She kicks her little feet, and Sukuna sighs, content, squeezing her to his side.
She didn’t have to, but she called Yuuji mom.
He winks at Yuuji, and locks Nobara in a headlock. “Quit kicking, you’re staying forever.”
Megumi watches him with large green eyes.
“You too. And your sister.”
Sukuna will work out the details later, but Yuuji watches Tsumiki too, sometimes. The kid likes her. It’ll be fine.
“I don’t believe you,” Megumi says, and Nobara bites him.
They sort out that issue, in the sense that Sukuna separates them, and lets Yuuji scold them while he basks in a good kill, and the satisfaction that comes from having things go his way. There’ll be more issues, but Sukuna’s confident in his ability to sort them out.
If all else fails, he’ll just have to burn the world down around them to keep this.