The key turned in the lock at six-thirty, the sound precise. Katsuki stood at the kitchen island, a glass of whiskey in one hand, a report in the other. He didn’t look up. The door opened, closed. Sneakers shuffled off. A familiar, hesitant presence filled the silent penthouse.

“Daddy?”

Izuku’s voice was quiet, but it carried a strange, thin wire of determination. Katsuki finally glanced over. His son stood just inside the living room, school bag at his feet, hands clenched at his sides. His green eyes were wide, fixed on Katsuki. Not fearful. Not ashamed. Something else.

“What.”

“I have something to show you.”

Izuku’s fingers went to the hem of his t-shirt. He pulled it up and over his head in one fluid motion, letting it drop to the marble. His small chest, the puffy brown nipples, rose and fell with a quickened breath. His hands went to his jeans next, unbuttoning, pushing them and his underwear down his thick thighs in a single, deliberate movement. He stepped out of the pile of fabric, naked on the cool floor.

Katsuki’s glass stilled halfway to his lips. His crimson eyes tracked down the familiar map of his son’s body—the freckles, the curve of his ass, the slight swell of his hips. He set the glass down. “And?”

Izuku took a step forward, then another, until he stood in the space between the living room and kitchen. The dim evening light from the floor-to-ceiling windows cut across his skin. He spread his legs, just a little. An offering. His tiny, hairless cunt was already glistening.

“Look at me,” Izuku whispered.

“I am looking.” Katsuki’s voice was a low rumble. “You come home, strip, show me your pretty begging cunt. You want something.”

Izuku bit his lip, his chin trembling. But his gaze held. “I don’t… I don’t want to be your cunny boy anymore, Daddy.”

The air in the penthouse went perfectly still. Katsuki didn’t move. “Explain.”

“I’m tired of just being the hole you use.” Izuku’s voice broke, but he pushed on. “I want to be your wife. Your little boy wife. I want… I want to have all your babies.”

A muscle in Katsuki’s jaw twitched. He slowly rounded the island, his bare feet silent on the marble. He stopped a foot from Izuku, his shadow engulfing him. The heat from his body was a wall. “You’re talking crazy.”

“I’m not.” Izuku’s hands came up, fingers twisting together. “I went to the clinic today. I’m off the birth control. It’s out of my system.” He looked up, emerald eyes blazing with a desperate, mad hope. “I’m empty, Daddy. And I want you to fill me. I want you to breed me. Please. Make me your wife.”

Katsuki stared at him. For a long, suspended moment, the only sound was the faint hum of the refrigerator. Then his hand shot out, grabbing Izuku’s jaw, forcing his head up. “You did what?”

“I want your babies,” Izuku gasped, tears spilling over his father’s fingers. “I want to be yours forever. Not just your slut. Your wife.”

Katsuki’s thumb brushed over Izuku’s wet cheek. His expression was unreadable, a storm brewing behind his eyes. Then, a slow, dark smile spread across his face. It wasn’t kind. It was possessive, triumphant, feral. “My wife.”

“Yes,” Izuku sobbed, leaning into the brutal grip. “Yes, Daddy.”

“You stupid, perfect little bitch.” Katsuki’s other hand came down, palming Izuku’s ass, squeezing hard. “You think you can handle that? Being my pregnant little whore? Walking around with my kid swelling up your boy cunt?”

“I can. I want it. I want everything.”

Katsuki released his jaw only to grab a handful of his green curls, yanking his head back. “Show me how bad you want it. Get on your fucking knees and beg for my seed.”

Izuku dropped instantly, knees hitting the cold marble with a crack. He didn’t wince. He looked up, lips parted. “Please, Daddy. Please breed your boy. Fill my womb. Make me yours.”

Katsuki undid his belt, his slacks, shoved them down just enough. His thick, uncut cock sprang out, already heavy and full. He tapped it against Izuku’s cheek. “Open.”

Izuku opened his mouth, taking the head in, his tongue swirling over the slit. He tasted pre-come and salt and pure Katsuki. He moaned, the vibration travelling up Katsuki’s shaft.

“That’s it,” Katsuki growled, one hand fisting in Izuku’s hair. “Suck your husband’s cock. Get it nice and wet for your fertile little pussy.”

The word ‘husband’ made Izuku whimper, his throat working as he took more of the massive length, his nose pressing into coarse blond hair. He sucked with a devotion that was worship, his hands clutching at Katsuki’s thighs.

Katsuki watched, his breath coming harder. “Look at you. My desperate little wife-to-be. You’ve been planning this, haven’t you? Dreaming of my cum taking root in you.” He began to move his hips, fucking into the wet heat of Izuku’s mouth in short, brutal thrusts. “Gonna pump you so full you’ll taste me for days. Gonna watch your tits swell. Your belly get round with my son.”

Izuku’s eyes rolled back, tears and saliva slicking his chin. He gagged, but he didn’t pull away. He took it, his own hips squirming on the floor, his wetness dripping onto the marble beneath him.

“Enough,” Katsuki snarled, pulling out. Izuku gasped for air, a string of spit connecting his lips to the glistening head. “Up. Bend over the back of the couch. Show me that empty cunt you want filled.”

Izuku scrambled up, stumbling to the large leather sofa. He bent at the waist, his chest pressed to the cool leather, his ass in the air. He reached back with both hands, spreading himself open. “It’s ready, Daddy. It’s so ready for you.”

Katsuki came up behind him, his rough hands sliding over Izuku’s ass. He leaned down, his breath hot on Izuku’s ear. “You better be sure, Izu. Because once I start, I’m not stopping until I’ve claimed every inch of this house with you. Until you’re dripping with me from the inside out.”

“I’m sure,” Izuku cried, pushing his hips back. “Please, I need it. I need you.”

Katsuki guided the broad head of his cock to Izuku’s soaked entrance. He didn’t push. He just rubbed, smearing pre-come and slickness, teasing the tight, fluttering ring of muscle. “Beg one more time.”

“Breed me, Daddy! Please, fuck your baby’s womb full! Make me your wife!”

With a guttural groan, Katsuki shoved forward.

The stretch was immense, a burning, perfect fullness that stole Izuku’s breath. He screamed, a raw, broken sound, as Katsuki buried himself to the hilt in one relentless thrust. His cock was so deep, Izuku could feel it in his belly, a hot, thick intrusion claiming him utterly.

“Fuck,” Katsuki hissed, his hips flush against Izuku’s ass. “So fucking tight. My little breeding slut.” He pulled out slowly, then slammed back in, setting a punishing rhythm from the start. The slap of his skin against Izuku’s ass echoed in the silent penthouse.

Izuku clawed at the leather, sobbing with each drive. It was rougher, deeper than ever before. Every thrust felt aimed, purposeful, as if Katsuki was trying to reach the very heart of him. “Yes! Daddy, yes!”

“You feel that?” Katsuki grunted, one hand wrapping around Izuku’s throat, pulling him up so his back was arched. “You feel how deep your husband’s cock is? It’s gonna plant right in your womb. Gonna tie you to me forever.”

He fucked him like that, standing, driving up into him with brutal, piston-like strokes. Izuku’s small tits bounced with the force, his nipples hard and aching. He was babbling, a stream of “yes” and “more” and “please breed me.”

Katsuki’s grip on his throat tightened, cutting off his air just as he angled a thrust that hit a spot so deep and electric Izuku saw stars. Izuku’s cunt clenched, gushing, his orgasm ripping through him silently, his mouth open in a soundless scream.

“That’s it,” Katsuki growled, feeling the violent spasms around his cock. “Squirt all over your daddy’s dick. Get nice and loose for my cum.” He didn’t slow, fucking him through the convulsions, chasing his own peak.

He pulled Izuku off the couch, turning him, lifting him. Izuku’s legs wrapped around his waist as Katsuki carried him, still impaled, toward the dining table. He bent Izuku back over the polished wood, the cold surface a shock against his overheated skin.

“New place,” Katsuki muttered, driving into him again. “Gonna claim you everywhere.”

This angle was different, deeper if that was possible. Izuku wrapped his arms around Katsuki’s neck, holding on as he was fucked over the table, his heels digging into the small of Katsuki’s back. Their mouths crashed together in a sloppy, biting kiss. Izuku could taste his own tears, his own slick, and the raw, masculine heat of his father.

“Close,” Katsuki warned, his rhythm becoming erratic, brutal. “Gonna fill you. Gonna knock you up right here on the goddamn table.”

“Do it!” Izuku screamed. “Give it to me, Daddy! I want it all!”

With a final, grinding thrust, Katsuki buried himself as deep as he could go and came. Izuku felt it—the hot, pulsing flood deep inside him, a sensation so profound it triggered another, smaller climax that left him shaking and limp. Katsuki groaned, his forehead dropping to Izuku’s shoulder, his hips stuttering as he emptied himself.

For a minute, they stayed like that, joined, panting in the dim room. Katsuki’s come leaked out around where they were connected, dripping onto the table.

He finally pulled out, his cock slick and spent. Izuku whimpered at the sudden emptiness, the loss of that intense pressure. Katsuki looked down at him, at the mess on the table, at the come already trailing from Izuku’s used hole. A dark pride shone in his eyes.

“Round one,” he said, his voice hoarse. He scooped Izuku up again, carrying him toward the hallway. “We’re not done. Not until I’ve put a baby in you.”

He took him against the wall in the hallway, Izuku’s back to the cool plaster, his legs hooked over Katsuki’s arms. He fucked him slow and deep this time, whispering filthy promises into his ear. “Gonna be so pretty pregnant. Gonna keep you barefoot and full of my cum in this house. My little wife.”

He came again inside him, a smaller rush, but no less potent.

He laid him on the plush rug in his bedroom, on his stomach, and entered him from behind, his weight pressing Izuku into the fibers. This was languid, almost tender, a relentless, deep rocking that had Izuku mewling into the rug. Katsuki played with his small tits, pinching his nipples, whispering about how they’d leak milk soon.

Izuku lost count of the times Katsuki filled him. The locations blurred: the bathroom counter, the floor of the walk-in closet, against the glass of the balcony doors overlooking the city lights. Each time, Katsuki would hold him close as he came, grunting his ownership, his promise, into Izuku’s skin.

Finally, as the first hints of dawn greyed the sky, they ended up back in Katsuki’s bed. Izuku was on his back, legs spread and trembling, his cunt red and swollen, overflowing with his father’s seed. Katsuki hovered over him, his own body slick with sweat, his cock hard yet again. He rubbed the head through the messy, mixed fluids on Izuku’s stomach.

“One more,” Katsuki breathed, his eyes locked on Izuku’s. “One more for good luck.” He pressed inside, a slow, stretching entry. Izuku was so open, so used, he took him with a broken sigh.

Katsuki moved slowly, his thrusts shallow, his gaze intense. “You’re mine,” he said, each word a vow. “My boy. My wife. The mother of my children. You understand?”

“Yes, Daddy,” Izuku whispered, his hands coming up to cup Katsuki’s jaw. “I understand.”

“You’re never leaving me.”

“Never.”

Katsuki’s hips stuttered. He came with a low, shuddering groan, collapsing on top of Izuku, his weight a comforting anchor. They lay tangled, breathing in the scent of sex and sweat and promise.

After a long while, Katsuki shifted, pulling out. He didn’t move to clean up. Instead, he gathered Izuku against his chest, one large hand splayed possessively over his flat, wet stomach. “Sleep,” he murmured, his lips against Izuku’s temple. “Let it take.”

Izuku closed his eyes, a fragile, unimaginable hope blooming in his shattered heart. He was ruined, claimed, and utterly, completely loved. He was going to be a wife.