Chapter Text
For the past month that Yuuji has lived and coexisted with his uncle, Yuuji cannot for the life of him decide if he loathes or likes the man. Yuuji is grateful he gets to have a roof over his head, food on the table, and someone to provide for his basic necessities in life after the passing of his grandpa– don't get him wrong, but his uncle-now-caretaker has a many… quirks in his day to day habits.
While probably a result of the man living by his lonesome for all of his adult life, since the day he left the nest of his fathers (Yuuji's grandpa's) home, Sukuna seems to have little grasp on how to behave when there are others in his home. Every morning, Sukuna wakes and immediately heads to the bathroom. Yuuji tends to already be up, getting ready for school, and so he gets to first hand witness the way his absurdly large uncle tucks into the bathroom without turning the light on, and without closing the bathroom door, whips his (in Yuuji's opinion) far too large cock out and unleash the heaviest morning piss Yuuji has ever seen and heard into the poor toilet. Yuuji always tries his best to ignore it, and it would be almost comical if it didn't stir heat deep in Yuuji's gut every damn morning; hearing his father's brother grunt at what seemed to be nearly a whole day's worth of urine at once left his body.
Yuuji, to his credit, tries his best at pretending he can't hear Sukuna's morning piss, and tries even harder to ignore how horny it makes him– it's gotten to the point where Yuuji will shamefully take a palm to his crotch as he listens, making quick work of humping his pussy against his hand before heading out the door for classes. It's driving him insane. Not just because his Uncle's bizarrely unaware but intense morning routine makes Yuuji question all his morals and why his uncle peeing makes him unfathomably horny (Freud Must have had something to say about this), but also because his damn uncle is never consistent with his morning piss, and it frustrates Yuuji to no end.
While most days Yuuji gets to use the bathroom first, getting to do his buisness and get ready, often enough for it to be a problem, Sukuna will already be in the bathroom when Yuuji needs it. One would think Sukuna would, like the gentleman he is, allow his nephew first dibs, especially since Yuuji needs to leave the house first, but alas, Sukuna seems to revel in making Yuuji wait. Yuuji has had one too many mornings where he's left awkwardly squirming near the dark open bathroom as Sukuna takes forever pissing, and hearing his uncle let go, feeling the pressure in his own bladder, and the heat roiling in his tummy as he listens to his uncle's relief, Yuuji can feel how wet he is, and can only hope it's just arousal and not urine. Yuuji truly does not know how much of this torture he can take before he starts begging Sukuna to let him go first, or even set an alarm for a designated morning piss time.
It all comes to a head on a thankfully not school morning. Yuuji wakes, eyes blearily opening, and immediately feels the twinge of his bladder calling him. He wants to whine, feeling so cozy under his blanket but uncomfortable from the pain in his abdomen, and so he rouses from his nest of a bed. As he makes his way out of his room, he can feel the pressure on his pelvic floor, thighs twitching together in attempt to stop himself from wetting his sleep shorts. He nears the bathroom door, but is stopped by the fact his uncle is also stepping towards the bathroom, coming from the opposite end of the hallway.
Yuuji is no fool. He knows simply racing Sukuna to the door will not garuntee he gets to use it first, and he'll have to give a damn good reason why he should get to go before Sukuna, because his rude and mean uncle doesn't know how to play nice. Yuuji weighs the options in his head, of whether begging his uncle to let him use the bathroom first or pissing his pants right outside of it, where his uncle will definitely see him as he gloats about getting the toilet first, and Yuuji knows he's willing to beg until he can't anymore.
Sukuna is glancing down at him, and Yuuji tucks his head towards his chest, hands clasped together in front of himself, as Yuuji near cries out “Pleaseee Oji-san you have to let me go first..! I'm like seconds away from pissing myself… please I promise I'll be quick..”and for a second Yuuji thinks it might've been better to suffer through pissing his pants instead of begging his uncle for permission to pee. One of Sukuna's brows rise upwards, his mouth twitching a bit, and Yuuji can hear the sleep still in his uncle's voice. “That's cute kid, but I don't care. I'm sure you can hold it for another minute. I gotta piss just as bad as you do.” His tone has a sort of finality to it, like Yuuji isn't allowed to even think he can argue with it.
But Yuuji isn't known for backing down, and he knows that if he has to hold it for even another 30 seconds he's going to be leaking out of shorts in no time. The desperation is getting to him, and it's fogging his critical thinking because he gets the brilliant idea that they can just… both go. Yuuji grabs at Sukuna's wrist as he tries stepping into the bathroom “Wait! Wait Oji-san please, I don't even care anymore we could, like, go at the same time? I really really can't hold it until you're done, please please, God! Oh!!” Before Yuuji's even capable of finishing telling Sukuna how desperate he is, Yuuji feels a trickle forcing itself out of him. His grip on Sukuna's wrist tightens somehow, and Sukuna's gaze on his bright red face shifts, eyes sharpening in a way that screams something like Hunger. His eyes trail down to the little wet spot between Yuuji's thighs, and he exhales a breath, sounding both almost endeared and exasperated. “God brat… Fine. We can both go. Whatever.” Sukuna tugs Yuuji by the hand on his wrist, pushing the boy into the bathroom first. Yuuji is still trembling, clenched and trying not to piss his pants anymore than he has, and the second he in front of the toilet his yanking his shorts down and sitting. Sukuna stands above the boy, gazing down, and he nudges his much larger thigh between Yuuji's. The boy takes the hint, and just parting his thighs makes him let go a bit, the sound of piss dribbling into the water below.
Now that the boy is less focused on not pissing on the floor, a wave of clarity hits him and the situation he is now stuck in; with his uncle standing in front of him on the toilet, his own bare pussy leaking piss into the toilet he's seated on, and Yuuji is seconds away from having his hot ass uncles penis right in his face, pissing between his legs while he does the same. Shit… Yuuji dares to look up while Sukuna is reaching into his own sleep pants, pulling his cock out. Sukuna is looking directly in Yuuji’s face, eyes dark with arousal. Weird. Out the corner of his eye he can see Sukuna pump his cock once before he aims it between Yuuji's thighs, and Yuuji's instinctively spreads his thighs wider, the flow of piss coming out of his pussy increasing. Suddenly the sound pee splashing increases tenfold as both uncle and nephews streams match up. Yuuji is trying to look away, but it's hard to look away when the cock that's been haunting his wet dreams and mornings is right in his face, loudly peeing. He can feel liquid splashing up in the toilet, and God, Yuuji is so fucking horny, tied between the feeling of his own release and watching Sukuna piss right in front of him. This is so not normal, right? This is not what a 15 year old boy and his uncle are supposed to be doing togther, right? Yuuji watches as Sukuna carefully aims his urine away from his cunt, but just the thought of the stream hitting against his clit has Yuuji whining a bit. Fuck, this was a bad idea. Sukuna seems to almost sense where Yuuji's mind has gone, and he knocks his wrist holding his dick just so, splashing his still violent stream against Yuuji's arousal. The boy lets out a much louder moan, still pissing mound shifting forward, angling his own stream nearly out of the bowl. suddenly seemingly agitated, whether by some unknown or the fact Yuuji almost got piss on his bare feet, Sukuna takes his free hand and grabs onto Yuuji's head, shocking the younger, eyes wide looking up at his uncle
“God you're horny for this brat- tired to pretending I never noticed you being a creep when ever I’d take my morning piss… you're so fucking into this you freak… God… bet you'd love it if I just pissed all up in you… fuckin’ just… go in your room instead of the toilet… God I wanna ruin you, damn Brat…” Sukuna's stream grew more erratic the more he spoke, it rising higher and higher, splashing onto Yuuji's lap and belly, and the boy was too stunned to respond. He knew he wasn't subtle, but he didn't realize how open a book he was apparently, his perversions now out in the open. “I- ah, I’m sorry, Oji-san– please! Please! Pee in mee… mark me like I'm your's, oh please, Sukuna…” Yuuji's mewling out, his uncle's hand in his hair yanking his head back even further, Sukuna forcing the last dregs of piss right onto his sweet nephew's face. “It's okay Yuuji, I hear you… bet you'd let me fuck yer cute little pee hole.. I'd ruin you forever, make you incapable of holding any of your pee… fuckkkk, you'd be my sweet little baby, gotta wear diapers or you'll piss everywhere like a new born. You want me to ruin you? Want me to fuck your piss hole baby? Fuck it nice a loose? I can't get you pregnant from that hole, so it'd be nice a safe, could even pee right inside your little baby bladder, God Yuuji..” While Sukuna's stream ended, he began pumping his cock with vigor right in Yuuji's face. Yuuji stared dazed at Sukuna's cock, but he felt how his whines rose in octave, like the boy was readily agreeing with every vile word spilt from his uncles mouth. Sukuna's hand on his head kept Yuuji steady as he rubbed the tip of his cock against Yuuji's lips, but didn't thrust in his mouth.
Almost shockingly quick, Sukuna's grip on his dick seemed to tighten, and cum sprayed out onto Yuuji's face. Sukuna once again rubbed the tip into Yuuji's mouth, making the boy clean the last of his cum and piss off his cock, before pulling back and letting go of the boy.
“You're such a good toilet for me Yuuji, aren't you? If you still want yer Oji-san to wreck you you better be a good boy, okay?”
Yuuji was so fucked.