The car door clicked shut, and the silence of the empty driveway was louder than the engine had been. Izuku’s fingers trembled on the front door key. Katsuki’s hand settled on the small of his back, a brand through his uniform blazer. “Inside,” he said, voice low. The command wasn’t for the door. It was for everything that came next.

The house was still, holding its breath. Sunlight cut through the blinds in dusty bars, painting the familiar living room in strange, stark lines. Katsuki didn’t look around. His crimson eyes were fixed on Izuku. “Strip. All of it.”

Izuku’s breath hitched. He fumbled with his tie, the knot stubborn. The soft rustle of his clothes falling to the worn carpet was the only sound—his blazer, his shirt, his pants, his panties. He stood there, naked in the middle of his family home, constellations of freckles stark against his flushed skin. He kept his eyes on the floor, on the edge of the sunbeam near his toes.

Katsuki sank onto the couch, the old frame creaking under his weight. He undid his slacks with deliberate, slow movements. He didn’t hurry. He pushed the fabric down his hips just enough, and his cock sprang free, heavy and uncut, resting against his thigh. His balls hung full beneath it. He patted his lap. “Come here.”

Izuku crawled to him. The carpet was rough on his knees, a familiar texture turned alien. He rose up, settling his weight onto Katsuki’s thighs, his own small, soft body cradled by the man’s hard, athletic one. He could feel the heat of Katsuki’s skin. Izuku leaned in, pressing a shy, closed-mouth kiss to Katsuki’s lips.

Katsuki’s hand came up, tangling in his green curls, holding him there. He deepened the kiss, licking into Izuku’s mouth, possessive and wet. “That’s it,” he growled against his lips. His other hand slid down Izuku’s spine, over the curve of his ass, fingers dipping between his cheeks. Izuku was already wet, his pussy slick and hot, a bead of arousal dripping onto Katsuki’s thigh. Katsuki hummed, satisfied. “Always ready for me. My good boy.”

The front door opened.

Footsteps in the genkan. A bag being set down. Then silence.

Toshinori stood frozen in the entryway to the living room, his tall frame casting a long shadow. His bright blue eyes were wide, uncomprehending, scanning the scene: his son, naked, perched in the lap of a blond stranger he’d never seen, the man’s massive erection blatant against Izuku’s thigh. The air left the room.

Katsuki didn’t move his hand from between Izuku’s legs. He looked over Izuku’s shoulder, meeting Toshinori’s horrified stare. A slow, challenging smirk touched his lips. He gave Izuku’s ass a firm, deliberate squeeze. “Go on,” he murmured into Izuku’s ear, loud enough to carry. “Ask him.”

Izuku’s whole body was trembling. He turned his head, his wide green eyes meeting his father’s. His voice was a broken whisper, raw with want and shame. “Daddy… please.” He swallowed, the word ‘Kacchan’ a secret fire in his chest. “I need it. I need his cock. But I… I want yours, too.”

Toshinori’s face went ashen. “Izuku,” he breathed, the name a shattered thing. “What… who is this? What are you doing?”

Katsuki’s smirk didn’t waver. His fingers, still tucked between Izuku’s cheeks, pressed inward, making Izuku gasp and squirm on his lap. “He asked you a question, Izuku. Explain it to him.”

“He’s… he’s Kacchan,” Izuku whispered, the secret name burning his tongue as he said it aloud to his father. “My teacher.”

“Your teacher,” Toshinori repeated, the horror dawning deeper, colder. He took a step forward, a protective instinct warring with the graphic scene. “Get away from my son. Now.”

Katsuki laughed, a low, rough sound. He wrapped his other arm around Izuku’s waist, locking him in place. “Your son’s pussy is dripping on my thigh. He’s not going anywhere.” He looked down at Izuku, his crimson eyes glinting. “Tell him what I am to you. In detail.”

Izuku’s breath came in short, sharp hitches. He felt Katsuki’s cock, a hard, hot line against his hip. He felt his father’s devastated stare. The words tumbled out, soaked in shame. “He… he trains me. He makes me good. For him. My body… it’s for him. But he said… he said you could have me, too. Tonight.”

“Have you,” Toshinori echoed, his voice hollow. His eyes flicked to the thick length of Katsuki’s erection, then back to his son’s pleading face. The memory of Izuku bent over the living room chair, of his own release inside him, rose up like a ghost. His own traitorous body stirred. “This is sick.”

“It’s what he wants,” Katsuki corrected, his voice a blade. He shifted Izuku on his lap, spreading the boy’s thighs wider with his own, putting the slick evidence of Izuku’s arousal on full display. “Look at him. He’s begging for it. For both of us. Aren’t you?”

Izuku nodded, a frantic little motion. He reached a trembling hand back, wrapping his fingers around Katsuki’s shaft. The skin was so hot, the weight immense in his hand. He looked at his father, tears welling in his big green eyes. “Please, Daddy. I’m so empty. I need to be full. I need… I need you to fuck me, too.”

Toshinori’s resolve cracked audibly, a sharp intake of breath. He was still standing there, still dressed for work, while his naked son offered himself like a sacrament to a stranger. To him. The wrongness was a tidal wave. The desire was an anchor. He took another step, then another, until he was standing right before the couch, looking down at them.

Katsuki watched him, a predator gauging his prey’s surrender. He guided Izuku’s hand, making him stroke his cock slowly, the foreskin sliding back to reveal the flushed, leaking head. “He’s all yours, old man,” he growled, the challenge clear. “Take what you’ve already taken. Or walk away and listen to him scream for it.”

Toshinori’s hand shook as he raised it. He didn’t reach for Izuku. He reached for his own belt, the click of the buckle deafening in the silent, sunlit room.

“Stop,” Katsuki’s voice cut through the click of the belt buckle, a command that froze Toshinori’s shaking hands. His crimson eyes were fixed on the older man. “He’ll do it. Use your words, Izuku. Tell your Daddy what you want to do.”

Izuku, still perched on Katsuki’s lap, felt the blunt, hot head of his teacher’s cock nudge against his slick entrance. He whimpered, the sensation a bright, distracting shock. He looked up at his father, whose face was a mask of conflict. “Let me, Daddy,” Izuku whispered, his own hands trembling as he reached for Toshinori’s waistband. “Please.”

His fingers worked the button, then the zipper, the sound obscenely loud. He hooked his thumbs into the fabric of his father’s trousers and briefs and pushed them down just enough. Toshinori’s cock sprang free, already half-hard, thick and veined. Izuku wrapped his small hand around it, feeling it jump at his touch. “I want to taste you,” he mumbled, his voice gaining a desperate rhythm. “I want to suck you while Kacchan watches. I want… I want you both to use me. I want to be in the middle.”

Katsuki’s hand tightened in his hair, guiding his head forward. “Show him.”

Izuku leaned in, his breath ghosting over the flushed head before his lips parted. He took the tip into his mouth, his tongue swirling around the crown, tasting the familiar salt and musk of his father. A low, choked groan escaped Toshinori, his hands coming up to hover helplessly at his sides.

“That’s it,” Katsuki growled, his own hips shifting minutely, his cockhead pressing more insistently against Izuku’s wet folds, spreading the slickness but not entering. “Tell him the rest. Tell him what your filthy little cunt wants.”

Izuku pulled off with a wet pop, a string of saliva connecting his lips to his father’s dick. He was panting, his eyes glazed. “I want you both inside me,” he gasped, the words tumbling out in a shameful, eager rush. “I don’t care how. I want Kacchan to fuck my mouth while you fuck my pussy. Or… or the other way. I want to feel both of you come in me. I want to be so full I can’t walk after.”

Toshinori shuddered, his cock twitching in Izuku’s grip, fully hard now. “Izuku…”

“He’s not lying,” Katsuki said, his voice a dark promise. He slid his hand from Izuku’s hair down to his hip, his thumb stroking the crease of his thigh. “This greedy hole is dripping for it. Can you feel how hot he is?” He pushed Izuku forward again. “Finish what you started. Make your Daddy hard for you.”

Izuku obeyed, taking his father deeper this time, his head bobbing. He hollowed his cheeks, his tongue working along the underside, his free hand cupping Toshinori’s balls. He moaned around the length in his mouth, the vibrations making Toshinori’s knees buckle. The older man’s hands finally landed, one tangling in Izuku’s green curls, not pushing, just holding.

Katsuki watched, his own breath coming harder. He could feel every desperate suck Izuku made, could see the boy’s throat working. He leaned close, his lips brushing Izuku’s ear. “Good boy. You look perfect like this. A perfect little slut for two cocks.”

Toshinori’s hips began to move, tiny, involuntary thrusts into the wet heat of his son’s mouth. His eyes were squeezed shut, a tear tracing a path through the stubble on his cheek. “I can’t… this is wrong,” he choked out, even as he pushed deeper.

“It is,” Katsuki agreed, his voice devoid of judgment, only fact. His hand slid around Izuku’s front, fingers finding his swollen clit. He rubbed tight, quick circles, making Izuku jerk and whimper around his father’s cock. “He doesn’t care. Do you, Izuku? You just want to be used.”

Izuku shook his head, a frantic no, then nodded, a desperate yes, his mouth too full to speak. His body was alight, strung between the cock in his mouth and the fingers on his clit and the impossible pressure of Katsuki’s thickness at his entrance. He was close, so close, his thighs shaking, a high, muffled keen building in his throat.

Toshinori’s control snapped. The last thread of paternal restraint broke with a sound that was almost a sob. His hands, which had been hovering, plunged into Izuku’s green curls and fisted tight. He yanked the boy’s head forward, burying his full, thick length down that small, wet throat in one brutal thrust.

Izuku’s eyes flew wide, a choked, wet gag tearing from him. He sputtered, saliva dripping down his chin, his body convulsing on Katsuki’s lap as his father began to fuck his mouth in earnest, short, savage strokes that hit the back of his throat with every snap of narrow hips.

“This is fucked,” Toshinori snarled, his voice raw and broken, each word punctuated by a thrust. “You’re my son. My son. And you’re on some stranger’s lap, begging for his cock while you suck mine. You’re a filthy, desperate little whore.” He pulled Izuku’s head back until just the tip remained, glistening with spit, then slammed back in. “Aren’t you?”

Izuku could only gag, tears streaming down his freckled cheeks, his nose pressed into the coarse blonde hair at his father’s base. He nodded frantically, the motion making him choke harder.

“Look at him,” Toshinori growled, his bright blue eyes wild with self-loathing and lust. He wasn’t talking to Izuku anymore. He was talking to Katsuki, to the room, to himself. “Look what you made him. Look what I’m doing to him. This is sick. It’s depraved. And he’s swallowing every inch. He loves it.”

The rant, the raw filth of it, the sight of Izuku being used so brutally, sent a jolt of pure heat straight to Katsuki’s core. A low, approving groan rumbled in his chest. “He does,” Katsuki growled, his own patience gone. While Toshinori used his son’s mouth, Katsuki lined up his own massive, uncut cock and pushed.

The blunt, hot head of him breached Izuku’s sopping entrance, stretching him wide in a single, inexorable thrust. Izuku screamed around his father’s cock, the sound muffled, vibrating through Toshinori’s shaft. Izuku’s back arched, his small body impaled front and back, filled beyond what should have been possible.

“Fuck,” Katsuki hissed, his head falling back, his hands clamping on Izuku’s hips. He was so tight, so hot, so perfectly, greedily wet. He pulled out slowly, watching his slick length emerge, then drove back in, setting a deep, punishing rhythm that rocked Izuku forward onto his father’s cock with every push.

Toshinori faltered, his hips stuttering as he felt the impact of Katsuki’s thrusts through his son’s body. He looked down, watching the stranger’s thick cock disappear into Izuku’s tiny, stretched cunt, the sight so obscene it stole his breath. “Oh, god,” he moaned, his own thrusts into Izuku’s throat becoming erratic, desperate.

“That’s it,” Katsuki panted, his abs flexing as he fucked up into the clenching, dripping heat. “Use his throat. He can take it. He was made for it.” He leaned forward, his mouth against Izuku’s ear, his voice a dark caress. “You feel that, Izuku? Both of us. You’re so full. This is what you wanted. Tell him.”

Izuku, strung between them, mind blank with overwhelming sensation, managed a frantic, gagging nod. Tears and spit coated his chin. His hands scrabbled at his father’s thighs, not to push away, but to hold on.

Toshinori looked into his son’s wrecked, pleading eyes and something in him broke completely. “You want this?” he demanded, his voice cracking. “You want your Daddy to come down your throat while your teacher fills your cunt?”

Izuku’s answer was a guttural, affirmative moan, his body clenching violently around Katsuki’s invading length. The vibration tipped Toshinori over the edge.

“Then take it,” Toshinori roared, his hips slamming forward, burying himself to the hilt. He held there, pulsing, as his release shot hot and bitter down Izuku’s throat. Izuku swallowed convulsively, his own orgasm tearing through him, his pussy milking Katsuki’s cock in rhythmic, fluttering spasms as he squirted, a hot gush soaking Katsuki’s thighs and the couch below.

The dual contractions, the feel of Izuku coming apart, were too much. Katsuki grunted, a raw, animal sound, and drove in one last, deep time. He spilled inside him, his own release flooding the already-slick channel. He stayed buried, panting, as Izuku went limp between them, a shuddering, oversensitive mess.

For a long moment, the only sounds were their ragged breaths and the wet, filthy drip of come. Toshinori slowly pulled his softening cock from Izuku’s bruised lips. He stared at his son’s ruined face, then at the man still sheathed inside him. The horror came flooding back, cold and clear. “What have we done?”

Katsuki carefully extracted himself, watching his own spend leak out of Izuku’s well-used hole onto the carpet. He smoothed a hand over Izuku’s trembling back. “We gave him what he needed.” He met Toshinori’s shattered gaze, his crimson eyes calm, victorious. “And we’re not done.”

Katsuki stood, his own release still glistening on his thighs. He undid the remaining buttons of his shirt, shrugged it off, and let it drop to the stained carpet. He stood naked before them, all coiled muscle and satisfied arrogance, his spent cock already beginning to thicken again. “Strip him,” he said to Izuku, his voice a low command that cut through the heavy silence.

Izuku, trembling and slick with both of them, slid from the couch onto unsteady legs. He approached his father, whose pants were still pooled around his ankles. Toshinori took a step back, hands raised as if to ward off a ghost. “No. This has to stop. This… this is a sickness. A father and son should never—”

“Daddy,” Izuku whispered, his voice raw from being fucked throat. He pressed close, his small, sticky hands going to Toshinori’s belt, working it open with a familiarity that made the older man flinch. Izuku rose on his toes, his lips brushing the shell of his father’s ear as he pushed the trousers and briefs down over narrow hips the rest of the way. “I’ve saved my virgin asshole for you.”

Toshinori froze, his breath catching. Izuku’s hands slid around to his bare back, holding him close.

“I want Daddy to be the first to fuck my tight asshole,” Izuku murmured, the words a hot, shameful secret against his skin. “It’s my surprise. Just for you.”

“Izuku…” Toshinori’s protest was a weak, shattered thing. He was naked now, exposed, his softening cock twitching against his son’s sticky thigh at the filthy promise.

“On the floor,” Katsuki ordered, settling back onto the couch. He spread his legs, his heavy cock resting against his thigh. “On your hands and knees. Present for him.”

Izuku obeyed, lowering himself to the carpet. The rough fibers scratched his knees. He arched his back, pushing his round, freckled ass into the air. The evidence of their first round leaked from his used pussy, a wet trail down his inner thigh. He looked back over his shoulder, his green eyes wide and pleading. “Please, Daddy.”

Toshinori stared, transfixed by the obscene offering. The boy’s small, pink hole was clenched tight, virgin and untouched, just below the slick, swollen mess of his cunt. The contrast was devastating. “It’ll hurt you,” he heard himself say, his voice hollow.

“He wants it to hurt,” Katsuki said from his throne on the couch. He reached for the bottle of water on the side table, took a sip, then poured a slow stream over his fingers. “He wants to feel you tear him open. Don’t you, Izuku?”

“Yes,” Izuku whimpered, pushing his hips back further. “I want to feel it. I want to remember.”

Katsuki’s wet fingers found Izuku’s pussy first, gathering the mixed slickness of their come and Izuku’s own arousal. He smoothed it back, over his perineum, coating the tight, nervous pucker. “Use this,” he told Toshinori, his voice casual, instructional. “It’s all he gets. He doesn’t deserve more.”

Toshinori sank to his knees behind his son. His hands, large and bony, settled on Izuku’s hips. They were shaking. He looked at the tiny entrance, glistening now, and felt his own cock stir painfully back to full hardness. The wrongness of it was a physical ache in his chest, but the want was deeper, older. “I’m sorry,” he breathed, not sure who he was apologizing to.

“Don’t be,” Izuku whispered, pressing his forehead to the carpet. “Just do it, Daddy. Please.”

Toshinori positioned himself, the broad head of his cock nudging against the forbidden place. It gave a little, a tight, hot resistance. He pushed forward, an inch, and Izuku cried out, a sharp, broken sound that was equal parts pain and relief.

“More,” Katsuki commanded, his crimson eyes fixed on the point where they joined. “He can take it. He’s mine. He can take anything.”

With a choked sob that was half a prayer, Toshinori surrendered. He drove forward, burying himself in the impossible, clenching heat of his son’s ass in one long, brutal stroke. Izuku screamed, his body bowing, his fingers clawing at the carpet. It was a violation so complete it felt like purity.

“God,” Toshinori moaned, frozen, fully sheathed. He was shaking. “Oh, god, Izuku.”

“Move,” Katsuki said, his own hand stroking his thickening length as he watched. “Fuck your son’s virgin ass. Claim it.”

Toshinori began to move, slow, deep pulls that made Izuku sob with every retreat, gasp with every fill. The pain was a bright, clean fire, scouring away the shame, leaving only a desperate, hollow need. “Daddy,” Izuku chanted, a wet, broken mantra. “Daddy, daddy, daddy.”

“That’s it,” Katsuki growled, his own arousal now a demanding throb. He watched Toshinori’s skinny frame piston over Izuku’s smaller body, watched the boy’s ass take the pounding, watched the dazed, ruined ecstasy on Izuku’s face. This was the lesson. This was the final blurring. The father, made into a tool. The son, made into a receptacle. And him, the architect, watching his design hold.

Toshinori’s thrusts became ragged, losing rhythm. “I’m… I can’t…”

“Come in him,” Katsuki ordered, his voice leaving no room for anything else. “Fill your son’s ass. Mark it as yours.”

The command was the final trigger. Toshinori slammed in, buried himself to the root, and roared as he emptied into the clenching, tearing heat. Izuku felt the hot flood, the intimate claim, and his own orgasm ripped through him with a violence that left him blind, squirting onto the carpet beneath him with a helpless, silent scream.

Toshinori collapsed forward over Izuku’s back, spent, sobbing. Katsuki rose from the couch. He stood over them, his shadow covering their joined, trembling forms. He looked down, his expression one of cold, profound satisfaction. “Good,” he said. The word was a period. A full stop. An end, and a beginning.