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“Daddy?” A small voice asks just as Sukuna is about to fall asleep. Yuuji decided a couple years ago that he’s a big boy now and he doesn’t need to sleep in his daddy’s room anymore, which Sukuna doesn't mind too much since he often gets his baby back in his bed anyway whenever the kid gets lonely and wants a hug in the middle of the night.
“Hmm?” Sukuna grunts, not opening his eyes, and he feels little hands grabbing at his blanket. He sighs and blindly reaches out for his son, scooping the kid up and onto his chest.
“Daddy, I’m scared,” Yuuji says, poking Sukuna in the cheek, and Sukuna groans, opening his eyes to look at Yuuji. “Can you check the closet again?”
“Yuuji, there’s nothing in the closet,” Sukuna mumbles and Yuuji whines.
“There’s something in there,” Yuuji insists, poking at Sukuna’s cheek again. “I saw it.”
“What did you see?” Sukuna asks, entertaining his son.
“A scary thing. It was in my dreams and it wasn’t there when I woke up, but it felt like it was,” Yuuji says, bottom lip starting to wobble, and Sukuna takes some calming breaths. He doesn’t want his son to start crying over this— he’s a loud one— and he also hates seeing Yuuji cry from anything but pleasure.
“It’s okay, baby,” Sukuna says, pulling Yuuji’s head down onto his bare chest and feeling warm tears on his skin. “Shh, shh, there aren’t any monsters. Just me and you.”
“But how do you know?” Yuuji asks, voice cracking, and Sukuna rubs his back.
“Why don’t you sleep here tonight?” Sukuna asks and Yuuji immediately cuddles into him. “Yes?”
“I wanna stay here, Daddy,” Yuuji says, kissing his chest wetly. “The monsters don’t come when Daddy’s around. They’re scared of you.”
“Yeah?” Sukuna asks and Yuuji nods. “I checked the closet earlier, so there shouldn’t be any monsters in there now if they’re scared of me.”
Yuuji shakes his head. “They come back once you leave,” Yuuji says and Sukuna doesn’t point out that Yuuji was the one that wanted to move out of his bedroom due to being a ‘big boy’ and would always have Sukuna around if he’d stayed sleeping in his bed.
“Okay,” Sukuna says, rubbing Yuuji’s back some more.
The weight of Yuuji on his chest is the most comforting feeling in the world and he’ll never deny his baby boy comfort. Sukuna lets his hand dip a little lower, cupping Yuuji’s little bubble butt and squeezing him gently. Yuuji makes an adorable noise and Sukuna squeezes him a little harder, humming.
“Daddy, ‘m tired,” Yuuji mumbles and Sukuna shushes him.
“I’m just touching, baby,” Sukuna says and Yuuji falls silent, letting his daddy touch him. Sukuna gets his fill of feeling Yuuji up after a couple minutes and sighs, wrapping Yuuji in his arms and kissing the top of his head. “Good night, Yuuji.”
“Night, Daddy.”
***
Yuuji wakes up wet and warm and he immediately knows that he peed the bed. Yuck. Yuuji sniffles as his eyes fill with tears and he sits up, sitting back on Daddy’s hips. Daddy is all wet, too, and Yuuji tries not to be loud as he starts to cry. Daddy is going to be so mad at him.
Yuuji works his damp shorts and underwear off and wrinkles his nose, tossing them over the side of the bed.
“Daddy?” Yuuji whispers and Daddy doesn’t stop sleeping, snoring away.
Yuuji carefully climbs off Daddy, so he doesn’t slip on Daddy’s pee slick skin, and he sees that he’s peed a lot. He needs to clean it up somehow, but he doesn’t want to turn on the light because it’ll wake Daddy up. Yuuji’s hand slips in the pee puddle on Daddy’s stomach and he lands in the puddle with an oomphf, cheek getting all wet from piss and tears.
Yuuji sniffs again and realizes that there’s only one way to make sure he gets all the pee without turning on the lights. He needs to lick it up until he can’t taste any more pee on Daddy or the sheets. Yuuji smiles to himself at his genius idea and starts sucking up his pee, quickly getting used to the taste. His piss doesn’t taste as good as Daddy’s whenever Daddy pees on him, but it’s okay and Yuuji feels his cock starting to get hard, especially when he finishes cleaning off Daddy’s stomach and moves down lower.
Daddy’s sleep shorts are wet, too, and Yuuji pulls them down, mouth watering when he sees Daddy’s big cock. Yuuji laps at Daddy’s inner thighs and around his cock, cleaning him up with his tongue, and saves Daddy’s cock for last. It’s not hard, but Yuuji can’t help but lean down to suck at the tip, just to see if he needs to clean it up, too. Yuuji tastes something salty and forces his mouth down lower, suckling and whining at how full his mouth is. He reminds himself he needs to be quiet or Daddy will find out what he’s doing, so he forces himself to be quiet, working his mouth over Daddy’s hardening cock.
Globs and globs of precome leak out of Daddy’s cock when Yuuji pulls off and Yuuji knows Daddy will be mad if he lets it go to waste, so he sucks at the tip, trying to let Daddy into his throat to make sure he won’t waste a single drop of Daddy’s yummy seed. He moans when Daddy grabs at him, his giant hand wrapping almost all the way around Yuuji’s thigh, and Yuuji looks up at Daddy’s face worriedly. Daddy is still sleeping away, though, and Yuuji continues sucking Daddy’s cock, mouth overstuffed.
Spit and come leak from the corners of Yuuji’s little lips and he gags a little when Daddy’s hips thrust up into his mouth, forcing himself into Yuuji’s throat too fast. Hot tears stream down Yuuji’s cheeks, but Daddy is still sleeping, so Yuuji knows he can’t cry too loud or he’ll wake up. Daddy continues to thrust and wreck Yuuji’s throat and Yuuji can’t help but whimper when Daddy’s hand tightens around the back of his thigh and his other hand settles on the crown of Yuuji’s head.
“Yuuji?” He hears and Yuuji’s eyes shoot up, seeing Daddy squinting down at him sleepily. Yuuji’s throat spasms in his surprise, the extra stimulation sending Daddy over the edge. Daddy groans, hand tightening in Yuuji’s hair, and Yuuji swallows all of his daddy’s yummy come and licks up the come and spit around his shaft that Yuuji wasn’t quite able to fit inside.
“Hi Daddy,” Yuuji says once he finishes, crawling up the bed and Sukuna’s chest to press wet kisses to Daddy’s face now that he’s awake. “Good morning!”
“Darling, it’s barely morning,” Daddy says and Yuuji’s bottom lip starts to wobble. “Hey, hey, I’m not mad. What happened? Did you get thirsty in the middle of the night?”
Yuuji nods and Daddy holds him a little tighter, kissing Yuuji’s cheeks.
“I peed,” Yuuji says and Daddy pauses, pulling back, which makes Yuuji whine. “Please don’t be mad, Daddy.”
***
Sukuna wakes up to hot wetness around his cock and he unconsciously bucks into it, hearing a familiar, soft noise that wakes him up a little more.
“Yuuji?” Sukuna asks tiredly and he hears his baby slobbering over his cock, choking a little, which makes Sukuna come straight down Yuuji’s throat, accidentally squeezing Yuuji’s little head. Yuuji doesn’t seem to mind, eagerly licking up all of the come Sukuna has to offer and bounding up to kiss him on the cheeks with his sticky mouth. Sukuna tries not to groan as he greets his son, checking the time and asking why he’s up so early.
“I’m not mad at you for peeing or getting thirsty, sweetheart,” Sukuna says after Yuuji explains, petting his son’s soft hair. “Do you want to get cleaned up?”
“I was cleaning up you, Daddy!” Yuuji says, eyes still a little wet, but fully off the verge of crying and seeming content to sit on Sukuna’s chest. He stinks a little bit and Sukuna chuckles.
“You’re a little dirty, though,” Sukuna points out, rubbing Yuuji’s back. It’s a bit advantageous that Yuuji is already dirty since he doesn’t have to reach too far for an excuse to get Yuuji even dirtier. “How about I make you feel good since you just made me feel good? And then we can take a bath.”
“Okay!” Yuuji says. He’s so easy to negotiate with.
“What do you want, baby?” Sukuna asks. “Do you want Daddy’s cock? Or do you just want my fingers?”
“I want Daddy’s cock,” Yuuji says, rolling half off Sukuna to grab at his soft but hardening cock. “I want the whole thing.”
“You think you can take the whole thing?” Sukuna asks, just to tease, and Yuuji nods. “Are you sure, baby?”
“I can, Daddy, I can!” Yuuji insists, excitedly rubbing his comparatively tiny hands over Sukuna’s cock and sending jolts of overstimulation through Sukuna. He needs a minute— he’s not as young as he used to be.
“Hah, baby, why don’t we get you ready first?” Sukuna says, grabbing their lube from the nightstand drawer and clicking open the bottle. If Yuuji had a tail, he’d be wagging it right now and, in any case, he wiggles his butt in Sukuna’s face, happy to get stretched open for his daddy’s cock.
“Good boys stay still,” Sukuna says, lightly slapping Yuuji’s ass, and Yuuji whines, stilling himself but vibrating with energy. Sukuna is bigger than him, though, and holds Yuuji still enough to fit a finger into his hole, knowing Yuuji should still be loose from when Sukuna fingered him a little last night.
“More, Daddy, I need more,” Yuuji says and Sukuna grabs him by the back of the neck to press him into the mattress. His baby slut loves being pinned down and Yuuji wriggles in delight at not being able to get up. “Ah, ngn! Daddy!”
“You’re such a whore, Yuuji,” Sukuna says, stuffing three fingers into Yuuji’s hole and then plunging in a fourth.
Yuuji squeals with pleasure, little cock twitching and squirting onto the dirty sheets. Sukuna’s really going to have to do a deep clean of the sheets (and perhaps the whole mattress) once they’re done here. Yuuji catches his breath, flopping flat against the sheets, and makes a surprised noise when Sukuna hauls him back up by his fingers in his hole. Sukuna smirks down at his baby boy.
“You didn’t think we were done, hmm?” Sukuna asks and Yuuji shakes his head, but he’s a bit slower in his reactions, more lazy and languid. Sukuna kisses Yuuji’s face as he curls his fingers and Yuuji giggles softly.
“Tickles, Daddy. Mmmm,” Yuuji moans, drooling a little bit. “C’n I have your cock now? Please?”
“Yes, baby, thank you for asking nicely,” Sukuna says, dropping a kiss on the top of Yuuji’s angelic head.
Yuuji wiggles his hips, hands coming up to spread his cheeks open and expose his winking hole. Sukuna licks his lips and lines up his thick cockhead to Yuuji’s small entrance, pressing with a good amount of force to squeeze inside. It’s always a tight fit, but they make it work and Yuuji loves the initial pain of the stretch, crying and moaning and wiggling to get away yet rocking back against every one of Sukuna’s gentle thrusts until he’s bottomed out inside of his baby boy. There’s a visible bulge where Sukuna’s cock pushes through Yuuji’s tummy and Yuuji rubs a hand over it desperately while Sukuna waits for him to get used to the stretch. Sukuna pushes Yuuji’s hand away when it gets a bit too good to be touched through Yuuji’s belly.
“Daddy, move, please,” Yuuji whines and Sukuna kisses the back of Yuuji’s head, sinking even deeper inside of Yuuji, before dragging himself out of his sweet clutch and fucking back in before Yuuji’s insides can start to remember their natural shape. They fuck slowly— more due to Yuuji’s tightness than actual desire to move at a glacial pace— until Yuuji’s whining turns a bit grating and Sukuna starts to fuck him harder to get him to scream for different reasons.
Sukuna loves the little noises his cock forces out of Yuuji and Yuuji’s squeals reach a peak as he comes again, tightening in little flutters around Sukuna’s cock. Sukuna fucks him through it and gets close himself. Yuuji is sinfully tight and Sukuna’s not as young and bursting with stamina as he used to be, so he thinks he’s pretty impressive he’s able to keep up with his baby boy at all.
“Fuck, Yuuji, just a bit longer, okay? Good boy, good boy,” Sukuna murmurs into Yuuji’s hair, kissing his ears as he thrusts into him. Yuuji cries at the overstimulation and Sukuna licks them up, grinning at Yuuji. He fucks into Yuuji a couple more times and releases, spilling his seed deep inside of Yuuji.
“Daddy,” Yuuji gasps, pressing on his tummy to feel his Daddy. Sukuna hisses and Yuuji does it again. “Can I— c-can I have more? Wanna be full.”
“Yeah, baby? Full of what? Ask nicely,” Sukuna says, catching his breath softly against Yuuji’s neck, and Yuuji whines.
“Pee,” Yuuji whispers, eyes wide. “I want your pee, Daddy. Please? It makes me so full.”
Sukuna groans and pushes Yuuji’s face down into the sheets, pissing in Yuuji barely a second after Yuuji asks for it. His bladder is full from the few hours of sleep he got and he empties every last drop into Yuuji, filling him up just like he asked. His belly swells enough that the tip of Sukuna’s cock pushing against his tummy isn’t as clear anymore and Sukuna grins. Yuuji whimpers when the pressure gets to be a bit much and he tries to get away when it starts to get too uncomfortable, but Sukuna holds him down, whispering soothing words against the shell of Yuuji’s ear.
A little shiver goes through Sukuna as he finishes up and Yuuji moans. “All done?” Yuuji asks, sniffling a little.
“All done,” Sukuna says, pulling out of Yuuji and watching the piss and come flow out in a rush.
They both cringe and Sukuna picks Yuuji up with one arm, carrying him to the shower to rinse them both off quickly. Yuuji yawns as Sukuna towels off his hair and Sukuna scoops him up again, bringing them both to Yuuji’s room. He doesn’t want to clean up the messy sheets in his own bed tonight and Yuuji’s bed is enough for them to squish into.
“Is it okay if we sleep here, baby?” Sukuna asks, pressing a light kiss onto the top of Yuuji’s head.
“Mhm. No monsters will come with you sleeping here, Daddy,” Yuuji says sleepily.
“Damn right they won’t,” Sukuna says, dropping them both onto the small bed and falling to sleep almost immediately, Yuuji held tight against his chest.