Chapter Text
How long are you supposed to wait after absorbing the King of Curses before jerking off?
This isn’t the type of question asked easily. Yuuji Itadori opted for a week, because that was about how long his body could stand the neglect. He’s a young guy, and healthy, and before this whole jujutsu thing jerking off was pretty much a nightly occurrence – so, realistically, he’d demonstrated herculean restraint in waiting as long as he did.
It never, ever occurred to him that Sukuna might get involved.
Or that it could improve the experience.
The first time it happened, Yuuji was in his dorm at Jujutsu High. He’d spent the day loping through the city with Fushiguro and Nobara; making generalized idiots of themselves in an attempt to navigate the confusing and sometimes terrifying world of jujutsu sorcery. And it was going well – Gojo had dropped them off and left them to their own devices, because he’s a pretty shit teacher, and they’d managed an independent exorcism.
Mostly because Fushiguro’s been at this for a long time, and Yuuji is a quick learner. They were all feeling good about themselves; treated themselves to fast food and arcade games after. By the time Yuuji got home, his body was relaxed and the world was starting to shift into a new normal that didn’t feel too bad.
And that normalcy was accompanied by the realization that he was pent the fuck up.
He’s got his own space – so he decided to do something about it. He shifted in his bed, clicked the lamp off, and leaned back, trailing practiced fingers over the modest bulge that had appeared in his pants about five minutes prior when his body decided it was finally time for some attention.
A sigh escapes his throat at the contact. It’s been too long – he’s missed himself. There’s no need to tease in these circumstances; he pushes his hand readily into his flannel pants, breaching the waist of his briefs in the process, and takes himself into a confident grip.
His dick immediately reacts, twitching happily into his fist.
Gods, it feels good to touch himself again. Yuuji drops his head back and closes his eyes, revisiting a catalog of well-rehearsed scenarios that never fail to get him going as he takes on a steady stroke. He decides to indulge a bit – plays with his head, twinges his balls, and widens his thighs because it always feels better when he’s spread open a bit.
He’s just starting to feel his own stomach up when something wetter than it should be slips against his penis.
Yuuji starts; immediately jerking from his reclined position and snapping his hand out of his pajamas. He twists, experiencing no small amount of shock, and squints at his palm in the dark. His eyes haven’t adjusted and he can barely see, but it’s not so dark that he can’t make out the distinct hole that’s opened up nor the fucking tongue wiggling out of it.
“What the fuck?!” Yuuji cries, throwing his hand away from his face and shaking it furiously as if he could dislodge the thing. It obviously doesn’t go anywhere, but the tongue wags around and makes horrible wet sounds as he does so.
“Holy shit what the fuck-!” he repeats in disbelief. He tries to wipe his hand on his sheets, continuing even when the mouth that’s opened up starts to soak through to his mattress.
“No, no, no! Please no, please go away,” he whispers furiously, eventually abandoning the effort and cradling his palm near his face as if it can hear him. And maybe it can – this whole vessel thing is new; he doesn’t know how it works.
The tongue only wags and licks at the air in response.
Yuuji stares at it, aghast, uncertain what he should do. Sukuna has opened mouths on him before, but it’s usually so brief that he’s back to normal before he’s even realized it’s happened. Does he just… wait?
Should he go get Gojo?
He sits there wondering. In the minutes that follow, his eyes adjust in the faint moonlight that penetrates his blinds and he watches the tongue in his hand execute complicated oral acrobatics. Twitching, lapping, extending out and wiggling its tip at him. It seems almost… lecherous, in intention.
He should probably get Gojo. This is weird.
Just as he’s shifting out of bed he hears a small slurping sound and feels his palm shudder to a close. He takes a deep, relieved breath, slipping his feet down to rest on the cool wooden floor and stooping to drop his head into his hands. His heart pounds erratically.
That scared the shit out of him – he thought this might be the big takeover everyone is so worried about. How mortifying would that be? Succumbing to Sukuna in the middle of jerking off.
He laughs tensely.
“Okay, you’re alright. Cool – good,” he placates himself, closing his eyes tight and massaging his face, not looking up. That was an… interesting experience.
His body is kind of amped up from it. He’s not all that turned on anymore, but he feels excited in a different way. Yuuji leans back after a while, blinking hard, trying to reorient himself. As his pulse calms he rolls onto his back and stares up at the ceiling, mulling it over.
It seemed like it… wanted to lick him, right? He feels his face go a little hot, recalling the wetness on his dick. It was really jarring – but, now that it’s over, he feels embarrassed as he recalls the second just before he had realized what was happening.
He feels embarrassed because it had felt really good, and suddenly he’s imagining a tongue on him. A pulse rises between his thighs at the idea.
“Oh come on,” Yuuji breathes, palming himself distractedly. He’s seen pornos with blowjobs in them; there was one he watched on repeat because it had close-ups of a hot chick with her mouth open wide, and she seemed to really enjoy having a cock rubbing around on her tongue.
The pulse gets stronger as he remembers how much he liked that.
He looks uncertainly at his palm, clenching his fist. “Don’t do that again,” he warns, opting to use his other hand to address the sudden urge that’s tenting his pajama pants. He pushes the fist where that mouth had opened under his back and crushes it beneath his weight – not wanting to take any chances. Then he slips his pants and underwear down one-handed and releases his dick, feeling it slap up against his stomach with a fleshy wop.
Alright… where was he?
Yuuji clenches his eyes, sighing and gripping himself. He starts pumping, thinking about that porno, imagining a tongue on him. Yeah… He starts aching and pushing his hips up as he strokes.
It’s just starting to get good when his palm splits open and his dick is suddenly wet again.
“Hnnng,” Yuuji groans in frustration and also, if we’re being honest, at the excellence of the sensation. “Fuck – off-,” he grits, but this time, he doesn’t stop. Screw Sukuna – if he’s doing this on purpose or if it’s some kind of instinctual reaction – it doesn’t matter. That bastard’s not going to ruin this for him. Yuuji sets his lips into a tight line and keeps jerking himself off, ignoring the way the mouth opens and laps at him as he does.
But he can’t ignore it for very long, because it’s making really awful sounds that make his stomach twist and thrill. He slows, hesitant, releasing himself and holding his palm over his face to stare at it again.
The tongue wiggles pointedly.
“Is this a joke..?” he murmurs, squinting. His dick pounds where it lies heavy against his stomach.
Fuck… would it really be the worst thing? Yuuji’s mind feels hazy with arousal; he’s a teenager – is he supposed to swear off masturbation entirely just because some ancient sorcerer is trying to interfere? Is this some kind of weird power play for Sukuna?
If he can’t ever jerk off again they might as well kill him – that was not part of the agreement.
He watches the tongue roll around with a conflicted expression. After a moment Yuuji sits up, spreading his thighs in the darkness and looking at himself. He’s swollen, his hips gyrating ever so slightly under his own attention, and he really wants to cum. With that thought in mind he reaches down hesitantly and hovers his hand near the tip of his dick.
The tongue darts out and flicks it.
“Hah,” he groans, jerking forward. Oh shit – is he really going to do this?
He nudges closer and lets it touch him more surely. His eyes cross a little, because the tongue sweeps over his head, finds his slit, and starts rolling against it.
Yep – he’s doing this. All the doubt abandons his body as he watches the tight pink muscle run his tip and work the end, making it shiny in the limited moonlight.
“Oh, fuck,” Yuuji moans heavily, scooting towards the sensation. It’s hot and moist. He takes his dick in his other hand and angles it towards the open mouth, and the tongue responds by lulling out flat. He pushes his dick along it, eyes rolling. This is definitely the worst thing he’s ever done – this makes the underaged gambling seem like community service in comparison.
A buried, perverted part of him likes how dirty it is.
He starts to stroke himself, breathing heavily, trailing the mouth in his palm down to his balls. He presses it flat against them and grinds into it, mouth dropping open when it starts massaging in response. A shudder sparks through him that coils his core.
It’s amazing – it’s the best thing his body has ever felt. Very little time passes before he’s got the damn thing running all over himself, letting it sucker onto his head and run greedily down the sides of his cock. It doesn’t seem like he can actually put his dick inside of it – and frankly, he’s too scared to try. But he jerks himself off with increasing urgency as spit from some unknown source drips down his thighs and the wet, textured surface drives him to the edge.
“Cum into it,” a deep voice cracks from his cheek.
Yuuji yelps, falling out of rhythm and flailing backwards. He instinctively slaps himself in the face – hard – and then he lies there dazed as his pulse thunders through his body.
“…W-what?” he asks, out of breath, mind foggy and shocked.
“You’ve got a nice dick, Yuuji. Cum in my mouth while I’m feeling generous.”
There’s no fucking way this is happening. Sukuna’s voice rings out in a low and dangerous tenor, making his cheek itch as it speaks. Yuuji feels a little bit like crying in frustration, and his dick is still throbbing from the onslaught he’d just been giving it.
“This is not happening,” Yuuji gasps, clenching his eyes and hoping he’ll wake up. He lies supine on his bed with his pajamas bunched around his knees, legs over the side, dick twitching, thinking execution doesn’t sound so bad anymore.
“Or you could put it up your ass, if you want,” Sukuna’s voice says, amused.
Yuuji doesn’t respond – thinking that if he stays quiet Sukuna will eventually go away. He considers going to get Gojo again, but dismisses the idea just as quickly, because if Sukuna is out and able to talk then he might feel like sharing what Yuuji had so brilliantly been doing with his mouth – and that’s just out of the question.
It is possible to die from embarrassment – he’s heard stories about it.
“I’ll eat your ass while you jerk off,” Sukuna continues, unfazed by Yuuji’s panicked silence. Then his voice takes on a commanding tone, and he says, “Put your hand down there.”
“No,” Yuuji hisses. “Go away!”
The voice goes quiet for a moment, and Yuuji tenses. Then his cheek itches and Sukuna speaks up again:
“Well, whatever. Then finish already – you’re making me frustrated.”
What? Can Sukuna feel what he’s doing? Yuuji experiences about ten emotions, and all of them are negative. He reels and rolls over, curling in on himself.
“If you don’t finish I’ll take over your body and do something worse,” Sukuna says matter-of-factly, making Yuuji shudder. It’s an empty threat – he’s got the sorcerer or curse or whatever he is under control. Not enough to stop him from talking, apparently, but Yuuji feels confident that Sukuna can’t just take him over. He would have done it already if he could.
Right?
“Don’t be so sure,” the voice goads.
Yuuji’s chest roils. How much of his life is Sukuna privy to? He takes a moment to collect himself, then shifts onto his back. He checks his hand – and there it is: the mouth, lapping at the air expectantly.
“…If I… finish,” Yuuji starts, twisting his lips in distaste, “…you’ll go away?”
Sukuna doesn’t answer, but the tongue starts going nuts. The part of Yuuji that isn’t horrified – which is about one billionth of a percent of him – reacts to the display with hunger.
His stupid fucking dick twitches.
“Say you’ll go away,” Yuuji demands, flexing his fist and glaring at it.
His cheek splits.
“No.”
Yuuji resists the urge to slap himself again. “Then I’ll wait you out,” he huffs, squaring his shoulders into his mattress and willing his body to relax. He drops his hand to the side and smothers it into his comforter, pointedly ignoring the wet sounds it makes as it mouths around in the fabric.
“Then I’ll come out every time you try to touch yourself,” the voice responds, “…until you don’t have a choice.” It goes thoughtful, and then adds, “Or I could just kill everyone you care about.”
Is he… being assaulted by his own body? That’s what this is – right? Coercion counts; he learned that in school. Consent matters, and it has to be enthusiastic!
“That’s offensive Yuuji,” Sukuna responds to his inner thoughts, which is really fucking concerning but not quite as concerning as the implication this monster is lobbing at him. “There are people who would die for a moment of my attention.”
He huffs. “I am not one of them – and you’re threatening me – so… it’s assault.”
And he’s not going to let the ghost in his head assault him; he’ll swear off of masturbation forever if that’s what it takes. Maybe there are alternative ways to get off… He mulls it over, thinking about his detachable showerhead in the quiet that lags unbroken after he says that, until Sukuna finally speaks up again:
“Consent…?” the voice repeats, sounding almost curious. “This is not a concept I’m familiar with.”
Yuuji actually laughs at the absurdity of it. “So, then, you’re a rapist.”
“No,” Sukuna sounds certain. He continues, “There has always been strong enthusiasm. You were pretty enthusiastic, a minute ago.”
His face goes hot. His dick has softened appreciably with surprise, but it pulses at the gruff way Sukuna is speaking to him – like it knows that mouth wants it and is receptive at the animal level. Fuck hormones, this is humiliating.
“I – that’s-” Yuuji doesn’t have a response. He thinks back to his health books, and recalls, “…physiological,” lamely.
“What other type of enthusiasm matters?” his cheek leers like this is a stupid topic. “Now finish. I like it, you like it, and it’s boring in here – what’s the problem?”
“I’m telling you I don’t like it.”
“But you do – you’re turned on. I can feel it.”
Yuuji rolls his eyes, feeling the tongue in his fist stretch out to trace the inside of his knuckles. He squeezes it tightly to still the sensation, ignoring the way his groin aches in response. “That doesn’t matter,” he grits, wishing this nightmare would end. His body is a traitor.
It’s quiet for a moment, and then Sukuna’s tone shifts into something strange and almost… placating.
“…Okay,” his cheek acquiesces, but to what – Yuuji isn’t sure.
The wet feeling in his palm recedes, and he hears a sound as the mouth in it disappears.
“I won’t make you,” Sukuna clarifies.
Yuuji exhales roughly, flexing his fist a few times and sitting up to stare at it. His pants are still down, and his dick is heavy between his thighs. He can feel his sheets with aching clarity; it’s pained when he mutters, “…I don’t trust you. You’re getting off on this.”
That seems pretty clear.
A sigh comes from his cheek, which is weird, because where are the lungs producing the air required to do so? How does this even work? Sukuna’s voice interrupts his train of thought, saying dryly, “I can’t help that I’m in here.”
Then he lilts, “…Unless you’d like to release me?”
Yuuji blanches, considering himself. He hovers near his dick, which twitches treacherously even without being touched, and waits for the mouth to open up again. It doesn’t, and after a moment he resigns himself to the situation. So – he’s going to have an audience. In most situations that would be a good thing, but he’s managed to end up in the one where it’s pretty horrible.
“Just do it,” Sukuna barks, making him jump. He adds, in a surprisingly uncharacteristic tone that boarders on earnest, “Please.”
What’s with this guy? You’d think he was a horny teenager and not the literal embodiment of sadistic power.
It actually… kind of makes Yuuji feel powerful. He has dominion over his body and the monster inside of it. Sukuna is trying to threaten him, but it’s pretty obvious he can’t do much in this situation. If he’s able to experience what Yuuji does – then maybe he’s just as pent up..? Is there some non-physical manifestation of a King sitting in the throne of his mind, aching and unable to achieve release?
Yuuji palms himself hesitantly, and his cheek hisses.
“…What the fuck-?” he whispers in disbelief, taking himself into a sturdier grip. “Can you feel this?”
“…It’s a shared experience,” the voice offers lowly. That doesn’t exactly answer the question.
His hips rut a bit when he rubs the head of his dick. He waits for the mouth to open, and when it doesn’t, he starts stroking himself more eagerly.
“Am I – like – jerking you off right now?” he wonders, dropping his head back. He hopes that’s not the case.
It’s starting to feel good again, especially because Sukuna doesn’t answer. He fucks up into his palm, and meets each movement with a sure pump, taking his time to grip the base of his cock tight and pull his foreskin down. Eventually, he reaches around with his other hand and massages his balls, eyes sliding shut. His breath gets heavier.
“You sure you don’t want it?” Sukuna asks, and for once it doesn’t scare him out of the practice.
Yuuji groans, falling back and flexing his feet into the bed so he can angle his hips up. “…Fuck – just – just the balls then.”
Why the hell not?
A mouth opens in his palm immediately and then there’s something hot and wet lapping against his testicles. Yuuji gapes and grinds his hips into the sensation, working himself excitedly with his eyes rolling at the mix of sensations. He abandons logical thought and decides to just enjoy himself; the mouth suckles onto him and massages him and sends jolts through his body.
Good, so good… his mind supplies this over and over while he fucks himself and Sukuna helps. What an awful delight; it’s not long before he turns his face into his pillow, biting at the air and gasping out, “The – the other one – do the other one too-”
His cheek itches and mocks, “I’m not sure you’re being enthusiastic enough, Yuuji.”
“Oh, fuck,” is all Yuuji manages, bucking. A mouth opens in his second hand – the one on his cock – and then it’s even better. He moans and lets the tongue work him, pushing back as it slips and slides along his length. “Fuck.”
“You taste good.”
Those words send him reeling. He tenses and lifts his hips higher, letting them go a little wild as he strokes himself in a tight grip without any semblance of coordination. The tongue presses flat between his hand and his dick, wiggling and providing a lot of lubrication. The other keeps going below.
Fuck – he’s gonna cum. He feels the familiar sensation of his dick growing thick and tight, although it’s muted because that tongue is in the way.
“You know I want you to,” Sukuna answers, even though he hasn’t actually verbalized anything. It sends Yuuji tripping over the edge when he adds, “Do it wherever you want,” in a tantalizing drawl.
He struggles out of his reclined position, breaking away from his balls and ignoring the disappointed sound that comes from his cheek as he stretches his palm out and angles the swollen head of his dick towards it. The mouth in his hand opens wide – expectantly – and seeing that along with feeling the one he’s still fucking along himself is enough to snag him by the chest and drag him into oblivion.
His dick shudders and hot bands of pleasure pulse along it, coiling his core. He groans loudly and watches with hazy eyes as a week’s worth of cum starts to surge out.
“Good boy,” his cheek purrs, “just like that.”
Yuuji feels a whimper catch in his throat as more and more thick fluid spurts from his shivering dick and lands in threads on the tongue in his palm. It laps it up and spirits it away to somewhere unknown. He pulls closer, pressing his cockhead into the undulating tongue greedily and rolling along the slick muscle as he unloads.
He can’t watch anymore – closes his eyes tight and huffs as his body spasms. This orgasm is more intense than he’s used to, and he isn’t sure if it’s because it’s been a while or if it’s the demon trying to eat him up.
“You’re so good,” Sukuna praises. Yuuji barely hears it over the blood pounding in his ears.
Eventually his pulse calms and he falls back, spent. He flops his hands up around his head, exhaling roughly, and hears the mouths slurp out of existence. It makes him tremble with satisfaction.
What a god damn nightmare. After a while, and with some effort, Yuuji stumbles to the bathroom to splash cold water on his flushed face. He’s a little sweaty, and Sukuna’s mouth on his cheek is finally gone. The little lines under his eyes seem curved more dramatically than usual – as if they’re grinning at him.
Sukuna makes good on his promise, and those mouths start showing up every time he even considers jerking off. Tongues wiggling at him suggestively, Sukuna’s teasing voice telling him he’ll have to say please if he wants to enjoy them again.
And Yuuji does. He starts to want them so bad, especially when Sukuna is withholding.
It’s… a pretty weird situation, if he thinks about it, which he tries not to. Jerking off is always a bit weird – until it isn’t – but with the addition of an active participant he’s not entirely sure this constitutes masturbation anymore. Frankly, that’s not even the weirdest part: the weirdest part is the negotiation that preempts it.
Sukuna seems extremely offended by the idea that he’s doing anything unwanted, and makes Yuuji enthusiastically consent – his words, usually dripping with sarcasm – before he’ll engage.
It’s not long before Yuuji’s taking suggestions, letting those mouths lap at his nipples or running wet palms along his neck when Sukuna asks him if he’d like that. Sometimes they bite him, and that’s really good; he lets them bite all over, and is glad he’s a fan of bulky and baggy clothing, because sometimes they leave marks.
Then there’s the weird stuff Sukuna says…
He likes to talk Yuuji through it, voice going strangely gentle but never losing its dark edge. Telling Yuuji he’s so good; that his body is beautiful. Calling him greedy in the best way, describing the taste of his cum with words that are sometimes so archaic that Yuuji isn’t entirely sure he knows what they mean. They sound positive, though.
In his defense – he’s almost always in the process of cumming when Sukuna does this, and by that point, he barely understands anything.
What a strange life he’s living. Yuuji resolves not to tell anyone, because your masturbatory routine is private and it doesn’t seem like it’s hurting anything. Sukuna isn’t any closer to breaking his control; they’ve just… found an equilibrium.
And keep pushing it further.
By the time Sukuna asks him to sit on his hand again, about six weeks later, Yuuji’s pretty much immediately on board. The feeling of a tongue circling his asshole is jarring, but Sukuna waits to suggest it until Yuuji’s already hand-fucked himself to the point of orgasm, and by then he’s so sensitive that he has no complaints.
“Let me put it inside,” Sukuna requests gruffly from his cheek. The mouth at his dick closes and disappears, and Yuuji whines at the sudden loss of heat and moisture.
“Oh, gods,” Yuuji gasps, disappointed except for the thing lapping behind him. He tries not to talk during these experiences, because sometimes he worries he’ll start calling Sukuna’s name and that would be one boundary too far. He’s on his knees in his bed with one hand pressed flat against his ass and trailing after his hips as they jerk into his palm.
The tongue rolls against his quaking circle of muscle, and his eyes cross. He drops his head back and sits into it hard, wiggling, loving it. “Ah – fuck, don’t make me – just – just do it-”
“You’re the one who wanted it like this,” Sukuna’s voice sounds like it’s smiling sometimes. Yuuji imagines that his eyes are dark and evil.
“Let me eat your beautiful ass,” his cheek lilts.
Yuuji leans forward enough to feel himself spread. The tongue probes but doesn’t enter; he feels its wet tip sliding against him and worrying the entrance just enough to tease.
Gods – he does want it; wants to feel something inside of him with a strange desperation. He pumps his dick and leans more weight into his hand, shifting to his knees. “…Do it,” he says with a shuddering breath, sounding pained. Somehow Sukuna has found a way to make consent both a huge turn on and humiliating.
“Hmm…” Sukuna hums, “I think we’ve got a special word, Yuuji.”
“…Please-!”
Sociopath. Monster. Evil fucking –
The tongue pushes forward with surprising strength and breaches the tight ring of his asshole. Just a little – just enough that he widens and feels a thrill of stimulation. It works the ring enthusiastically, sending jolts of pleasure through him. Yuuji moans, pushing back towards it, forgetting to jerk himself off.
But Sukuna doesn’t forget. A mouth opens on his dick again, and then he’s getting it from the front and the back. Yuuji gasps, finding that whichever way his hips go – there’s something good.
He’s so blessed – Sukuna’s so fucking generous. King, king, king; his pleasure is a throne that Sukuna’s built with three mouths – two to work and one to instruct.
“Do you like it, Yuuji? I’m fucking you with my tongue. You’re getting fucked right now.”
Yuuji makes unintelligible noises as the wet thing in his ass slowly slips in further. He has to press his palm tight to give it more reach. It twists and rolls inside of him, working his walls until he wishes it was bigger. Wants more.
“Yes – it’s good – yes, fuck me,” Yuuji devolves, dropping his head into his sheets and writhing. His arms are tired but he doesn’t care – is delirious with the feeling.
He’s gone, spilling a heavy load into an eager mouth while the one behind him delves as deep as it can and drives him past points he didn’t think existed. He doesn’t hear the darkness in Sukuna’s voice when it answers his cries:
“…Soon.”