Work Text:
The clock on his desk read 23:49 pm.
He should be asleep, they should be asleep. Any other family is asleep by now, exempted from the world's troubles for a few hours in their peaceful sleep. But not them.
There were obscene slurping sounds coming from between his legs. His blanket was thrown off, and his black, silky night shorts had been slipped off and tossed somewhere besides him. A hand had slipped under his night vest, it cupped and rubbed his chest, pinching his nipple here and there.
He sounded like a desperate man between his legs. The way he grunted and moaned into his pussy like he was the one getting off eating his son’s pussy out, and not Katsuki getting off having his cunt licked and tongue-fucked by his own sire.
He was probably enjoying this more than he was meant to be.
A finger pressed into his soaking and awaiting hole. It prodded, softly, against the velvety skin within and twisted in and out of him. Before he knew it, he was grinding against the mouth sucking on his clit and humping back into the finger pressing deep in him.
Katsuki’s head rolled back each time those fingers moved deep into a certain part of him. His hair had started to cling to his face, and the bed beneath his ass felt damp. The air around him felt hot and heavy to breathe in. He was soaking wet, and he needed more.
One more hard suck pulled at his clit and he came undone. He could feel his juices trickling down his ass - well those his daddy couldn’t drink up when he squirted.
“Daddy, please.” Katsuki moaned, fingers gripping dark locks between his legs.
“No more,” he panted. It had been at least over an hour now.
But with the way green eyes practically glowed up at him while he flattened his tongue against his cunt and continued to lick up and down his clit, Katsuki knew it was far from over.
His body moved towards without warning, suddenly his father was above him, staring down at him with those green eyes he's come to adore.
A thick weight pressed against his thigh, starting a low grind between them before it moved lower and starting rubbing up and down between his folds. This is what he wanted, this is what they both desire most.
“Please, Daddy.” Katsuki begged, “Knot me,” he moaned, as he ground up into that thick cock teasing his hole.
His lips pressed against his in a slow, almost sweet kiss. When Katsuki felt his need start pressing into him, it turned downright filthy. His tongue swallowed him whole, Katsuki barely had time to breathe. He'd slipped in so easily from how wet Katsuki had been, and soon more obscene noises started filling their bedroom. Noises no father and son should be making, but that didn't matter in their home.
Not right now, not when Katsuki could feel his eyes starting to cross as he frantically tried to hump back into his daddy, but the strong grip on the thigh that was wrapped around his sire's waist kept him rooted into the mattress while his cunt was fucked into over and over again.
His father whispered filthy words into his ear, ones no one else would get to hear because they were made for him. He was nothing but a slut, hungry for his own sire's cock.
“Wanna get you pregnant, baby,” The man panted above him. He was close. Katsuki could hear it in the desperate lilt in his voice - the crack of hunger clawing higher and higher within him.
“fuck, I'm gonna make you a mommy and lock you up at home. Fuck yes baby, take it take it!” His voice climbed higher but grew rougher. Katsuki's own whimpers and keens matched his volume, begging for his daddy's knot and drowning the room in their love making.
“Yes, Daddy, please! Want it so bad, daddy!” Katsuki begged with each thrust into his pussy, “ Yes, yes, yes! Yes, Daddy! ”
He was slowing, his thrusts grew pointed before he pulled Katsuki onto his lap, and fully pushed him down onto his awaiting knot.
Katsuki squirted onto him. His stream fought against the huge knot humping into his pussy, and trickled down around it. His toes curled and his head lolled back, a soft moan slipping past his lips as he grinded slowly onto the knot, and lips kissed and sucked at his neck and chest.
“Take my knot, baby! Fuck, yeah, just like that.” Izuku groaned into his ear. Those large hands fondled and gripped his ass while he was grinded up into him, pushing his cum deeper.
Sound completely left him, his own soft moans sounding like they were muffled under cloth. The insatiable desire that filled his body before started dull, being replaced by the warmth of skin on skin he was having instead. Their bodies were hot to the touch, looking almost feverish against the warm lamplight.
When the high had finally started to simmer down, Katsuki was gently laid onto his back and rolled onto Izuku's chest. Fingers carded through his wet hair, and sweet words were whispered to redress the filthy words from before.
Katsuki could feel his potent cum still releasing deep within him. It made him clench around the knot and he knew the other could feel it. A hand slipped between them and rubbed slow circles against his clit. Katsuki moaned and whimpered from the stimulation but didn't shy away. When he came again, it was with a soft moan against his sire's ear, and kiss being pressed into his lips, before his dazed state finally led him to sleep.
____________________
This was their routine. Almost every night, after school had let out, after dinner had been served and normal family conversations had, Katsuki was always being treated to sinful pleasure from his father, Izuku. His mouth and cunt used and thoroughly bred at night.
It was a pure accident when it first started - their taboo relationship.
Izuku knew from an early age that he and his son were far too close. At 10, his precious Kacchan still slept in his bed; it had taken years of coaxing before the stubborn boy finally gave in and slept in his own room. Although there were the complications of Katsuki waking up in the middle of the night to sneak into his bed or nightmares when the dark became too scary for him to handle alone, they managed.
Katsuki was his pride and joy. There was nothing his sire wouldn't do for him.
Katsuki was spoiled rotten by him. The softest of blankets and pillows that money could buy went into his nest. He bought the silkiest of pajamas for him to sleep in. The newest tech with high specs for his baby to work with. He told him he deserved only the best. And in turn Kaccahn made sure to keep his grades up and be kind to others, even if his words carried a bit of bite to them.
It was late into a Friday night, the lights in the house were switched off, the neighbours’ dogs were asleep, Kacchan was asleep, and Izuku himself was meant to be asleep but after two hours of tossing and turning in bed, he had rolled onto his back and decided to have a little “me time” session.
But, 12 year old Katsuki - face clearly etched with the remains of a nightmare - had wandered into his room while Izuku still had his cock in hand. Seeing those red teary eyes and rosy cheeks staring up at him in shock made Izuku cum. He gripped his cock, and moaned Katsuki's name in front of the boy.
When it was all said and done, Izuku embarrassingly hid his lower half while walking the young omega back into his room.
They didn't speak about it, not a word. Not until Katsuki had wandered into the bathroom while Izuku was showering and touching his cock, asking too many curious questions about his actions.
This time, Izuku made him watch. This time he had him use his hands and mouth to satisfy the boy’s curiosity and himself. Kacchan didn’t have many questions to ask after that.
And well, 5 years later, and they still hadn’t stopped that routine.
They were careful. Only touching and kissing when they were in the safety of their home. Katsuki was only allowed to climb into his daddy's lap and hump him however he pleased when there were no guests that day, lest their scents get stuck onto the couch and needed a day of airing to get out. But the bedroom and his office were safe.
They could have all the fun they wanted, for now anyways.
____________________