The doorbell rang at three in the afternoon, a sound the house hadn't heard in years.

Izuku’s hand went to the swell of his stomach, six months rounded and firm under his t-shirt. He stood frozen in the hallway, charcoal dust on his fingers. Katsuki was already at the door, his body a rigid line of tension, his palm flat against the wood as if he could feel who was on the other side.

“You ready, Mom?” His voice was low, not quite a question.

Izuku took a shaky breath. “Open it.”

Katsuki turned the knob. The couple on the porch looked weathered, aged by two decades of searching. Inko Midoriya’s green eyes, so like Izuku’s, went wide, then instantly filled with tears. Beside her, Toshinori Yagi looked gaunt, his tall frame leaning on a cane, his own eyes shocked and soft.

“Izuku?” Inko whispered.

And then they were moving, a tangle of limbs and choked sobs in the doorway. Inko’s arms wrapped around Izuku, tight and desperate, her face buried in his shoulder. Toshinori enveloped them both, his large hand cradling the back of Izuku’s head. The smell of rain and old wool filled the space.

“My boy,” Toshinori rasped. “We never stopped looking.”

Katsuki stood back, watching, his jaw tight. Izuku reached a hand out blindly, and Katsuki took it, letting himself be pulled into the knot. Inko pulled back, her tear-streaked face looking up at Katsuki.

“And you… you must be Katsuki. My grandson.” Her voice broke. “You were just a baby.”

She hugged him too. Katsuki stiffened, then slowly, awkwardly, let his arms come up around her smaller frame. His eyes met Izuku’s over her shoulder. Possessive. Anchoring.

They moved to the living room, the air thick with unspoken years. Inko’s gaze kept dropping to Izuku’s stomach, her hands twitching in her lap. The tea Katsuki made sat steaming and untouched.

“You look… you look well, Izuku,” Toshinori said gently. “The house. It’s good.”

“We manage,” Izuku said softly, his hand finding Katsuki’s knee. A silent signal: *steady*.

Inko finally couldn’t hold it in. “Izuku, honey… you’re…” She gestured, her expression a mix of joy and confusion. “Are you…? Is there… a father?”

The plan, the agreed-upon lie about a donor or a brief, failed relationship, evaporated in the heat of the room. Izuku opened his mouth, but Katsuki spoke first, the words ripped from him like a confession he’d been dying to make.

“It’s me.”

Silence. Heavy and complete.

Inko blinked. “I… what do you mean, Katsuki?”

Katsuki’s hand tightened on Izuku’s. “I’m the father. He’s mine.”

Toshinori’s frail body went very still. Inko looked between them, her brain slowly, painfully, connecting the words to the way Izuku was leaning into Katsuki, to the possessive curve of Katsuki’s arm around his mother’s shoulders.

“You’re… together?” Her voice was small.

Izuku found his voice, soft but clear. “Yes, Mom. We are.”

“He’s my mom,” Katsuki said, as if that explained everything. And to him, it did.

Inko made a sound, a tiny gasp of pain. Toshinori’s knuckles were white on his cane. The air turned jagged, sharp enough to cut.

“How long?” Toshinori asked, his voice grave.

“It’s… new. And not new,” Izuku whispered, his eyes pleading. “It’s just us. It’s always been just us.”

“He’s my whole world,” Katsuki stated, his red eyes challenging, defiant. “I protect what’s mine.”

Inko covered her mouth, tears spilling anew. Not happy tears. Grief tears. The kind that mourns a path you can never take for your child. “Izuku… he’s your *son*.”

“I know.” Izuku’s own tears fell then, hot and fast. “I know what it is. But he’s also… he’s my home. After everything… he’s the only thing that’s ever been real.”

They talked. Haltingly, in circles. Izuku spoke of loneliness, of a marriage he now knew was a cage. Katsuki said nothing of murder, only of protection, of a love that burned everything else away. They held each other on the couch, a united front against the world’s judgment, even from the people they’d mourned.

Finally, Toshinori sighed, a sound of immense weariness. He looked at Inko. Her face was pale, etched with sorrow, but her eyes were on Izuku’s stomach. On the life growing there.

“We… lost you once,” Inko said, her voice trembling. “We can’t… we can’t lose you again. Even if we don’t understand.”

“We can try,” Toshinori added softly, his gaze resting on Katsuki. “To accept that you’ve made a family. However… unorthodox.”

It wasn’t approval. It was a threshold. They chose to cross it.

The pain was a living thing, a white-hot coil tightening around Izuku’s spine. He screamed, sweat soaking his hair, Katsuki’s hand crushed in his own.

“You’re doing perfect, Mom,” Katsuki growled, his face pressed to Izuku’s temple. “So fucking perfect.”

Inko was on his other side, a cool cloth on his forehead, her earlier shock replaced by a fierce, maternal focus. “Breathe, sweetheart. Just like that.”

Another wave hit, and Izuku arched off the hospital bed, a raw, guttural sound tearing from his throat. He pushed. The world narrowed to pressure, to fire, to Katsuki’s voice anchoring him in the storm.

“I see the head!” Inko cried, her voice full of wonder.

One more agonizing, monumental push, and the pressure released in a sudden, shocking rush. A thin, indignant cry pierced the room.

Izuku collapsed back, sobbing, as the tiny, wriggling, bloody being was placed on his chest. He looked down, his vision blurred. Ten fingers. Ten toes. A shock of damp, blond hair.

“Fuck,” Katsuki breathed, his own cheeks wet. He was staring, utterly shattered and rebuilt in the same instant.

Izuku looked up at him, exhausted, radiant. Katsuki bent down, capturing his lips in a kiss that tasted of salt and sweat and pure, undiluted joy. It was slow, deep, a silent vow passed between them.

“He’s beautiful,” Inko whispered, her hand on Izuku’s arm, her own tears falling onto the sheets.

“Dynama,” Izuku said softly, his finger tracing the baby’s cheek. “His name is Dynama.”

Katsuki nodded, his thumb stroking Izuku’s jaw. “Yeah. It is.”

Spring light filtered through the new, soft yellow curtains. The old desk was gone, the dark wood replaced by a white changing table. The haunted air of Masaru’s study had been scrubbed away, painted over in warm, creamy white. It was a nursery now.

Izuku hummed softly, swaying with a drowsy Dynama in his arms. The baby’s small fist was curled around his thumb. Katsuki finished securing the mobile above the crib, a spinning galaxy of stars and planets.

“He’s out,” Izuku murmured.

Katsuki came over, his body warm against Izuku’s back. He looked down at his son, his expression one of awestruck possession. He pressed a kiss to Izuku’s shoulder, then to the top of Dynama’s head.

“Our boy,” Katsuki whispered.

“Our boy,” Izuku echoed.

They laid him gently in the crib, watching until his breathing deepened into the steady rhythm of sleep. Katsuki took Izuku’s hand, lacing their fingers together, and led him silently from the room, leaving the door open a crack.

Their own bedroom was bathed in the golden light of dusk. As soon as the door closed, Katsuki turned, caging Izuku against it, and kissed him. It was hungry, full of the day’s bottled-up tenderness and a deeper, older heat. Izuku melted into it, his arms looping around Katsuki’s neck, his body fitting perfectly against the hard lines of his son’s.

Katsuki’s hands found the hem of Izuku’s sweater, pushing it up. His palms were warm and rough on the soft skin of Izuku’s belly, soft from birth. He kissed a path down Izuku’s throat, sucking a mark over his pulse.

“Kacchan,” Izuku sighed, his head falling back against the door.

“Mommy,” Katsuki rumbled against his skin, the word a dark caress. He knelt, nuzzling into Izuku’s stomach, his hands sliding down to cup Izuku’s ass, pulling him closer. His breath was hot through the thin fabric of Izuku’s sweatpants.

Izuku carded his fingers through Katsuki’s spiky hair. “We promised them,” he whispered, his voice already shaky. “No more babies.”

Katsuki looked up, his crimson eyes glinting in the low light. A slow, wicked smirk spread across his face. “Were we really gonna stick to that?”

Izuku looked down at him, at the love of his life, his son, the father of his child. The man who had killed for him, died for him, and lived for him. A soft, bashful smile touched his lips. He shook his head. “No.”

Katsuki’s smirk softened into something genuine, something unbearably fond. He stood in one fluid motion, capturing Izuku’s mouth again. This kiss was different. Slower. Deeper. A promise of forever, of a future built on ruins, of a family that defied every rule.

He walked Izuku backward toward their bed, their lips never parting. The world outside, the judgments, the ghosts, all of it fell away. There was only this room. This kiss. This perfect, stolen happiness, glowing like a secret at the stroke of midnight.