The key turned in the lock with a soft, domestic click. Inko Midoriya pushed the front door open, her overnight bag slung over one shoulder, and froze. The air that met her was thick, warm, and carried a scent that was unmistakable—musky, salty, sweet. And the sounds. A wet, rhythmic slapping. Guttural moans. A high, broken whine that twisted into a sob of pleasure. Her polite greeting died in her throat.

She took two steps into the genkan, her shoes forgotten, and the living room came into view. The scene was lit by the harsh afternoon sun streaming through the blinds, illuminating every detail in brutal clarity. Three naked bodies. Her son, Izuku, on his hands and knees on the rug, his back arched obscenely. Behind him, driving into him with a frantic, punishing rhythm, was Toshinori—her husband—his face a mask of agonized ecstasy. And in front of Izuku, also buried deep inside him, holding Izuku’s face in his hands, was a blond stranger. The room reeked of sex, of sweat and spend and something primal.

“That’s it, take it,” the blond man growled, his voice a rough command. He gripped Izuku’s hair, forcing eye contact. “You’re so fucking full, aren’t you? Your daddy’s wrecking your ass and I’m owning this cunt. Say it.”

Izuku’s eyes were glazed, tears and sweat streaking his freckled cheeks. His mouth hung open, drool slick on his chin. “S’full… Kacchan… so full—”

Toshinori let out a choked sound, his hips stuttering. “Mine,” he gasped, the word ripped from him as he pistoned forward. “My boy, my—”

“You’re nothing but a hole for us,” Katsuki cut in, his crimson eyes locked on Izuku’s, ignoring Toshinori completely. “A perfect, used little fuckhole. Aren’t you?”

“Yes!” Izuku screamed, the sound raw and shattered. His body convulsed, a fresh gush of clear fluid soaking the rug beneath him as he squirted, his pussy clenching violently around Katsuki’s cock. “Yours! I’m yours, Kacchan, I’m daddy's slut, I’m—!”

Inko’s bag hit the floor with a thud. The noise was small, swallowed by the cacophony of flesh and filth. But Toshinori’s head snapped toward the entryway. His bright blue eyes, wide with horror, met hers. The frantic rhythm of his hips faltered, stopped. The illusion shattered.

Katsuki didn’t stop. He kept moving, a slow, deep roll of his hips, his gaze sliding from Izuku’s ruined face to Inko’s frozen one. A cruel, satisfied smirk touched his lips. “Looks like we have an audience, Izuku.”

Izuku, bliss-drunk and desperate, just whimpered, pushing back against both of them. “Don’t stop, please, don’t—”

Inko stood there, her hand pressed to her mouth. The wet sounds continued. The smell filled her lungs. Her husband. Her son. A stranger. In her living room. On her rug. Her vision tunneled, the depravity etching itself into her forever.

Toshinori made a broken noise, trying to pull away, but his body betrayed him, hips giving one shallow, involuntary thrust. “Inko… I…”

Katsuki laughed, low and dark, his hands possessive on Izuku’s hips. “Welcome home, Mrs. Midoriya.” He thrust hard, making Izuku cry out. “We were just finishing up.”

Katsuki’s grip on Izuku’s hip tightened, his thrusts slowing to a deliberate, grinding pace that made Izuku sob. He didn’t look at Inko. He looked at Izuku’s ruined, blissful face. “Turn your head, baby. Look at your mommy.”

Izuku whimpered, his body trembling as he obeyed, his cheek pressing against the sweat-damp rug. His green eyes were hazy, pupils blown wide. He saw his mother’s silhouette in the doorway, her hand over her mouth, her whole body rigid with shock. A fresh wave of heat pulsed through him, his pussy clenching greedily around Katsuki’s cock.

“Tell her,” Katsuki commanded, his voice a low, intimate rumble that vibrated through Izuku’s core. “Tell your mother what we’ve been doing in her house all weekend.”

“M-Mommy,” Izuku breathed, the word a wet gasp. Toshinori made a choked sound of protest, but his hips gave another shallow, involuntary thrust, burying himself to the hilt in Izuku’s ass. Izuku moaned, long and loud. “Kacchan… and Daddy… they’ve been… they’ve been taking such good care of me.”

“Details,” Katsuki growled, snapping his hips forward. “She wants to know.”

“We’ve been fucking,” Izuku moaned, the crude word falling from his lips with shocking ease. “Since Friday. Everywhere. On the couch… in Daddy’s bed… the kitchen counter… the shower.” His voice hitched as Katsuki angled deeper, hitting a spot that made his vision whiten. “Kacchan fucks my pussy… and my mouth… and he taught me how to suck Daddy’s cock… and Daddy fucks my ass… he took my virginity there… right here on this rug…”

Inko made a small, wounded noise. Toshinori shuddered, a tear tracking through the sweat on his temple.

“How many times?” Katsuki prompted, his hand sliding around to press against Izuku’s lower belly, making him feel the thick intrusion. “How many times have you come for us, Izuku?”

“I lost count,” Izuku cried, his body beginning to shake with the building pressure. “So many… I squirt every time… I came on the kitchen floor… I came with Daddy’s cock in my throat while Kacchan watched… I came with both of them inside me, filling me up…” He was babbling now, the words pouring out in a filthy, joyous confession. “It’s the best… the best I’ve ever felt… I’m so full… I’m their fuckhole, Mommy… their perfect little fuckhole…”

Katsuki’s smirk was a blade. “Tell her whose.”

“Yours, Kacchan!” Izuku screamed, his back arching violently. “And Daddy’s! I’m yours! I’m—!”

His words dissolved into a wordless, shattered cry. His body seized, every muscle locking tight. A gush of clear fluid, more powerful than before, shot from him, arcing through the air to splatter against the leg of the coffee table and the nearby floorboards. He squirted hard, his pussy milking Katsuki’s cock in frantic, rhythmic pulses as he sobbed through the overwhelming climax.

The convulsions of Izuku’s orgasm triggered Toshinori’s. With a broken groan that was half a sob, Toshinori buried himself deep and stilled, his own release pumping hot into Izuku’s ass. He collapsed forward, his forehead pressing between Izuku’s shoulder blades, his large frame trembling.

Katsuki rode out Izuku’s clenching waves, his own breath coming in harsh pants, but he didn’t finish. He held himself back, maintaining that iron control even as Izuku went boneless beneath him. Slowly, he pulled out, his thick, glistening cock leaving Izuku’s well-used pussy gaping and dripping.

The room was silent except for the ragged breathing of three men and the quiet, choked sounds from the doorway. The smell of sex was overpowering.

Katsuki stood, his nudity a statement of absolute dominion. He looked down at Izuku, who was trembling and mewling softly, then at Toshinori, who was still slumped over his son, hiding his face. Finally, he turned his crimson gaze to Inko.

“Any questions, Mrs. Midoriya?” His tone was conversational, as if discussing a parent-teacher conference.

Inko’s hand fell from her mouth. Her face was paper-white. “You… you animal,” she whispered, the words barely audible. “Get away from my son.”

“He’s not asking me to,” Katsuki said simply. He nudged Izuku’s hip with his foot. “Are you, Izuku?”

Izuku stirred, a blissful, dazed smile on his swollen lips. “Don’t go, Kacchan…” he mumbled, nuzzling the rug.

Inko flinched as if struck. She looked at her husband. “Toshinori. Get up. Get off of him.”

Toshinori flinched, but he didn’t move. His shoulders hunched further. A low, devastated sound escaped him.

“He can’t,” Katsuki answered for him. He walked, with deliberate slowness, to where his trousers were discarded over an armchair. He pulled a cigarette from the pocket and lit it, the flame stark in the dimming light. He took a drag, exhaling smoke toward the ceiling. “Your husband’s in pretty deep. Literally and figuratively.”

“This is rape,” Inko said, her voice gaining a shred of strength, edged with hysteria. “You’ve raped my son. I’m calling the police.”

“Izuku,” Katsuki said, ignoring her. “Tell your mother if you want me to leave.”

Izuku pushed himself up onto his elbows, wincing slightly as Toshinori finally, slowly, pulled out of him. He turned to look at his mother, his expression heartbreakingly earnest amidst the sweat and sex. “Mom… no. Please. Don’t make him go. I love him.”

The word ‘love’ hung in the foul air, more shocking than any profanity.

“You don’t know what love is,” Inko choked out. “He’s your teacher! He’s… he’s done this to you! He’s twisted you!”

“He made me feel real,” Izuku said, his voice trembling but clear. He shifted, wincing again, and a trickle of white fluid leaked from his ass onto the rug. He didn’t seem to notice. “He sees me. He wants me. He and Daddy… they make me whole.”

Toshinori finally moved, scrambling back on his hands and knees like a crab, putting distance between himself and Izuku, between himself and Inko’s gaze. He curled in on himself, his face a mask of utter shame.

“Toshi,” Inko pleaded, taking a step into the room. The smell hit her more strongly, and she gagged. “Look at me. Tell me this… this monster forced you. Tell me you didn’t want this.”

Toshinori lifted his head. His bright blue eyes, usually so kind, were hollow. He looked from his wife’s devastated face to his son’s blissful one, to the smug, smoking figure of Katsuki Bakugo. He opened his mouth. Closed it. A tear rolled down his cheek. He said nothing.

His silence was the loudest confession.

Katsuki took another drag of his cigarette. “He wanted it. He still wants it. They both do.” He flicked ash onto the floor. “You’re the outsider here, Inko. This is their family now. A new arrangement.”

“You’re insane,” Inko breathed.

“I’m pragmatic.” Katsuki stubbed the cigarette out on the sole of his bare foot, not flinching. “Your son belongs to me. Your husband belongs to the fact that he fucked his own son raw all weekend and loved every second of it. And you…” He let the sentence hang, his eyes raking over her. “You have a choice. You can scream, call the cops, blow up all your lives. Your son goes to juvie as a sex offender for seducing his teacher and his father. Your husband goes to prison. I get a slap on the wrist and a new teaching job in another prefecture. And you lose everything.”

He took a step toward her. Inko stood her ground, trembling.

“Or,” he said, his voice dropping to a conspiratorial whisper. “You accept that things have changed. You keep your family. Your husband. Your home. And you get to watch your precious boy become exactly what he was meant to be.”

“I will never accept this,” Inko spat, but the fire was fading, drowned in a sea of impossible horror.

“You will.” Katsuki’s certainty was absolute. He glanced back at Izuku, who was watching him with adoring, hungry eyes. “He’s pregnant, by the way.”

The room went utterly, deathly still.

“What?” The word was torn from Toshinori, his first in minutes.

“No,” Inko whispered.

Izuku’s hand fluttered to his lower belly. A slow, wondrous smile spread across his face. “Really, Kacchan?”

“Timing’s right,” Katsuki said, his gaze locked on Inko. “Been filling him full all weekend. It’ll be mine. But it’ll be your grandchild, Inko. Your husband’s grandchild. A new branch on this very fucked-up family tree.” He let the cruelty of it sink in. “So. You going to call the cops on the father of your grandchild? Or are you going to go make some tea and let the men clean up?”

Inko’s legs gave out. She sank to her knees just inside the living room, on the threshold between the clean oak floor and the sex-soaked rug. She stared at Izuku’s hand on his stomach, at the hope dawning in her son’s eyes, at the utter ruin of her husband’s face.

She had walked into a nightmare, and the nightmare had offered her a deal. To live inside it forever.

Izuku crawled toward her, ignoring the mess, the soreness. He stopped at the edge of the rug, looking up at her. “Mom? It’s okay. It’s going to be okay. Kacchan will take care of us. All of us.”

He reached for her hand. Inko recoiled, snatching her own hand back as if burned.

Izuku’s smile faltered, just for a second. Then it returned, softer, pleading. “You’ll see. It’s better this way.”

Behind him, Katsuki Bakugo watched, a king surveying his conquered territory. The lesson, finally, was complete.