Chapter Text
Aizawa sighed as he got home, smiling at his son who was yelling for their cat.
“Izuku, you’re dirty. You have to take a bath bub,” now Izuku didn’t hate the bath. Actually the 6 year old rather enjoyed bath time but the boy obviously didn’t want anything to do with getting clean as he chased around the cat, tracking dirt on the floor.
So with a sigh he scooped the boy up as he ran past him and carried him to the bathroom, stopping to get some clothes for the both of them then locking them in the bathroom since he knew Izuku was likely to try and run out if he didn’t. And like clockwork, as soon as Aizawa put him down to turn on the shower, the boy was whining and running to the door trying to get out.
“Izuku,” he muttered.
“No! No bath daddy,” the boy screamed, tears coming to his eyes and Aizawa sighed heavily. He knows the child wants to play but just thinking about the dirt he already has to clean up makes his eye twitch.
“How about bathing with daddy kiddo? Would you like that?” He asked, turning the shower on so they could get the dirt off before getting in the bath. Izuku stopped whining and sniffed, looking up at the man and the shower.
“With daddy?” He asked and oh Aizawa loved this kid. He was just too adorable for his own good. Aizawa nodded and even took his shirt off before Izuku nodded. He always loved bathing with his daddy, but as he got older it stopped happening, which he didn’t like at all.
Aizawa got undressed and threw his dirty clothes in the hamper before helping Izuku do the same. He checked the temperature of the water before letting Izuku into the shower and stepping behind him. With a bit of a fight, he decided to just clean the boy entirely, helping Izuku clean his entire body before doing the same with himself and stepping out to fill the bath.
While the bath filled he quickly washed Izuku’s hair, placing kisses over the boy’s face as he did so making the little boy’s giggles fill the bathroom. When the tub had finished filling, Aizawa turned off the shower and stepped out with Izuku, making sure to stay on the mat so they didn’t get water on the floor. He checked the temp of the water and stepped into it, lowering himself and Izuku into the water with a sigh.
Hopefully a hot bath would tire the boy out and he’d be ready to sleep afterwards. Izuku sat in his lap playing with a couple of his toys. Aizawa placed a hand on the boy’s stomach and his breath hitched as he felt his cock harden underneath Izuku.
He couldn’t help it. Izuku was a comfortable weight against him and being able to feel the boy’s cunt moving over him as Izuku shifted on him was driving him insane. He sighed and slipped down in the tub more, his cock slipping between the boy’s cheeks. Izuku didn’t pause his playing as he resituated himself on his dads lap.
Aizawa trailed his hands up Izuku’s stomach to his chest, brushing his fingers over his nipples before dragging his hand back down and in between his thighs, fingers softly sliding through Izuku’s cunt. Izuku huffs but otherwise continues to play, this isn’t new to the boy, already used to Aizawa’s touches. Aizawa was a very bad man, a horrible person for even thinking about fucking his 6 year old son. He swore he’d wait until the boy was at least 10 but the thought of waiting another four years to get inside of him was driving him insane.
He brushes over the boy's clit, smiling when Izuku jumps at the sensation. He stops playing and turns his head to look at his dad, face filled with confusion and awe at the feeling.
“What are you doing daddy?” Izuku asks with a tilt of his head.
Aizawa pressed harder against his clit and leaned down to kiss the boy’s forehead before capturing his lips in a kiss, grabbing Izuku to turn him towards him. Izuku straddles his waist instinctively, and Aizawa groans softly as his cock slips between the child’s folds.
He licks his way into the boy’s mouth, bringing a hand to cup the back of Izuku’s head and kissing him harder. His other hand gripped Izuku’s hips lightly and gingerly thrusted his hips, sighing as his cock dragged against his son’s pussy. Izuku’s hands found purchase on his shoulders, tiny fingers digging into his skin.
He moaned as Izuku gasped and whined into his mouth, hips shaking as Aizawa thrusted against him, the water sloshing around them slightly as the movement. His hips stuttered and his stomach tightened as he came, his semen shooting into the water and up Izuku’s chest. He sighed, pressing another kiss to Izuku’s lips and sat back, watching with a small smirk as Izuku whined louder, hips moving on their own.
“Daddy,” the boy moaned softly, eyes wide and shiny with tears as he rubbed himself against his dads still hard cock.
“You want more baby?” He asked, voice hoarse. He smiles when Izuku nods his head rapidly, hips stuttering over him as he tries chasing an orgasm Aizawa wasn’t sure the boy could have.
He runs his fingers through Izuku’s curls, allowing the boy to grind on him and smiles through his whines. Aizawa shushes him, placing light kisses over his boy’s cheeks before pecking him on the lips and pressing a finger to his hole. He pushes in a single finger, biting his lip as Izuku clenches down on his single digit tightly with a wince.
He doesn’t pause as he slides his entire finger into Izuku, only stopping when he reaches his third knuckle. Izuku pants, face screwing up in slight pain and Aizawa brings his other hand down to circle his clit, smiling when Izuku’s face falls with a loud moan.
It’s a bit of an awkward position, with Izuku sitting in his lap facing him so he removes his finger, ignores the sob his son lets out and turns Izuku around before pushing his middle finger back into him.
Izuku’s head slams into his sternum at the feeling, legs trembling as Aizawa starts pumping his finger in and out of him. He moans shakily, pussy slicking up around Aizawa’s finger as he slowly thrusts, pressing deep into Izuku before slowly pulling out and pushing back in. Even under water, Aizawa can tell Izuku is getting wet, and adds another finger. Running his free hand down Izuku’s chest to soothe the boy as he starts wincing.
Even as Izuku grabs his wrist, holding it tightly, Aizawa continues pushing his two fingers into him, grinding his palm into Izuku’s clit when he’s fully in, causing Izuku to let out a hoarse shout at the sensation.
“Daddy!” Izuku moans, squeezing around his fingers.
Aizawa moans, pulling his fingers out of the Izuku’s cunt before slamming them back in. He spreads his fingers, stretching his tight cunt before plunging back into him. He’s aching, cock hard and heavy in the water beneath the boy’s ass and fuck, he wants to cum. Wants to push into Izuku right now and fuck him until they see stars.
But he waits.
Izuku shakes and cums around his fingers and Aizawa adds a third. The boy is babbling, shaking his head but no words form, unable to due to being overstimulated. He’s pushing on Aizawa’s arms, clenching around his fingers and Aizawa can’t tell if his son wants him to stop or to keep going.
Not like it matters, because he won’t be stopping until he’s fucking his seed into his beautiful sons tight pussy.
“Good boy Zu,” Aizawa groans, pressing his face into Izuku’s curls as he pounds the boy’s cunt with three of his fingers before quickly pulling them out, pressing a wet kiss to Izuku’s neck at the whimper the boy let out.
He turns Izuku around, making them face each other once more and presses their lips together as Izuku wraps his small legs around his waist. He grabs his cock and strokes it before rubbing the tip against Izuku’s cunt, nudging his clit.
Aizawa pulls away from the kiss and presses the head of his cock to Izuku’s entrance and pushes in, eyes transfixed on the boy as he slowly enters him. He watches as Izuku’s face scrunches up, mouth opening with a silent cry as his cunt is stretched far beyond what it should be. Aizawa presses a light kiss to Izuku’s cheek and slides in further, groaning at the squeeze.
“Fuck sweetheart, you’re so tight,” he moans, grabbing the boy’s waist in both hands, shuddering at how his fingers connect around the boy’s waist. He pulls the boy down as he pushes in and Izuku’s eyes go hazy at the pain and pleasure. He doesn’t stop, slowly sliding deeper into his boy until their bodies connect and they both moan.
Izuku because he’s stuffed full of cock. More than he should ever be able to handle at this age (which should be none lol) and Aizawa because of how tight his son is clenching around him. This tight, wet and warm hole barely stretches around him and Aizawa can’t wait to fuck Izuku again and again, molding the shape of his dick into his pussy until it’ll never forget him.
He sits there unmoving and allows them both to breathe after he bottoms out. Aizawa sucks down Izuku’s body, leaving light and dark hickeys down his body. After a few moments of allowing Izuku to somewhat get used to his size, he slowly pulls out, shushing the boy when he starts whining.
When it’s just the head in, he pushes back back, legs trembling as he has to stop himself from slamming into Izuku and probably hurting him more than necessary. He moans as he bottoms out again, squeezing Izuku close as he sets a slow pace, paying attention to the boy in his arms.
Izuku lets himself be moved, eyes blurred as he stares at his father and reaches for him, wrapping his arms around Aizawa’s neck loosely. “Daddy,” Izuku moans faintly, clenching down on the cock spearing him. “Please.”
And Aizawa isn’t sure what the boy is pleading for but he presses their lips together and licks into Izuku’s mouth, surrounding him, inside and out.
Without pulling out, Aizawa raises to his knees and leans over his boy before drawing back and slamming into Izuku, setting a rough pace. He groans loudly as his balls slap against Izuku’s perky ass and water splashes around them with his rough thrusts. He makes sure Izuku stays out of the water but otherwise loses himself in his son's cunt.
He pulls the boy down to meet his thrusts, swishing and squelching noises drowned out Izuku’s whines and his groans. Aizawa bit his lip as he plunged into the child, watching his cock as it disappeared into Izuku, eyes switching from where the boy’s pussy stretched almost impossibly around him to the slight bulge in the boy’s stomach.
“Ha shit,” Aizawa sighed, thrusting into Izuku harder, the slapping of his hips meeting Izuku’s echoing in the bathroom, as he chased his orgasm. “Fuck baby, I’m gonna cum okay? Want daddy to fill you up hmm? Don’t you want daddy’s seed?” He muttered, fucking into Izuku faster, precum leaking into him like a fountain.
“Yesyes yes please daddy wan, want daddy’s seed please,” Izuku babbled, words unknown to him spilling from his slick and kiss-swollen lips.
“Yeah? Okay, daddy’s gonna fill you up, gonna fuck some babies into my baby,” he groaned loudly, “Ooh shit,” he moaned, eyes clenching shut as his mouth fell open, fucking into Izuku as hard as he could before stilling as he came deep into his son.
He held Izuku close, hugging the boy to his chest as he came, grinding into him to push his semen as deep as possible into him. His cock pulsed, twitching as he came and came and Aizawa could feel some of it drip down around his cock as it spilled out.
“Good boy Izuku, such a good boy,” he sighed into the child's ear, pressing soft kisses to Izuku’s cheeks. He slowly sat back down into the tub, waiting a few minutes so they could calm down before slowly pulling out of Izuku, ignoring his small cries, and held the boy up a bit so he could see his cum drip out of his puffy, fucked out cunt.
Humming, Aizawa pulled Izuku close to him and smiled as the boy nuzzled into him and fell asleep. He would need to get Izuku clean again, and out of the bath and dried so that the boy didn’t get sick but for right now he simply relaxed.
After all, a sick day would mean more time together.