Iidabaku

The common room of Heights Alliance was usually a chaotic symphony of teenage energy, but at three in the morning, it was supposed to be a tomb. Katsuki Bakugo counted on that silence. It was the only time he could shed the explosive, abrasive armor he wore like a second skin during the day.

He moved through the darkened kitchen with practiced, silent efficiency. In his left arm, he cradled a warm, heavy bundle wrapped in a soft yellow blanket. Katsuya, only seven months old and possessing a tuft of spiky blonde hair that mirrored his own, was currently chewing on a fist and let out a soft, rhythmic whimper.

"Yeah, yeah, I know, brat. The milk’s coming," Katsuki murmured, his voice a low, gravelly rasp that held none of its usual vitriol. He reached into the fridge, pulling out a pre-prepared bottle. He looked down at the infant, his expression softening into something so tender it would have sent Class 1-A into a collective state of shock. "You’re just as impatient as your damn father."

He set the bottle in the warmer, leaning his hip against the counter. He was wearing nothing but loose grey sweatpants, his bare chest scarred from training but relaxed in the dim glow of the microwave clock. He didn't hear the footsteps—he felt the shift in the air, the familiar presence that always made the hair on his arms stand up in anticipation.

Tenya Iida stepped into the kitchen. During the day, he was the rigid, hand-chopping class representative who followed every rule to the letter. At night, especially when it was just them, that rigidity melted into something far more predatory and possessive.

Without a word, Tenya slid behind Katsuki, wrapping his thick arms around the blonde’s waist. He pressed his chest against Katsuki’s back, burying his face in the crook of his neck and inhaling deeply.

"You smell like baby powder and spice," Tenya whispered, his voice dropping an octave into a sultry, dark baritone. "It’s driving me insane, darling."

Katsuki leaned back into the embrace, letting out a huff that wasn't quite a laugh. "Get off me, Four-Eyes. I’m trying to feed the kid. And don't call me that, it's embarrassing."

"You love it when I call you that," Tenya countered, his hands sliding down from Katsuki’s waist to rest dangerously low on his hips. He nipped at the sensitive skin of Katsuki’s earlobe, making the blonde shiver. "You look so beautiful like this. Soft, tired... domestic. It makes me want to lock you in this room and never let you leave."

"You're a perv," Katsuki muttered, though he tilted his head to give Tenya better access. "A repressed, horny nerd."

"Only for you, honey," Tenya murmured, his hand wandering to the front of Katsuki’s sweatpants, tracing the waistband. "Katsuya is getting so big. He looks just like you. But I was thinking... he might need a sibling soon. You’re so incredible as a father, Katsuki. I want to see you like this again. I want to fill you up and make you pregnant again. I want to see how round and heavy you get when you’re carrying my next child."

Katsuki’s face flushed a deep crimson, his breath hitching. "Tenya... the kid is right here. Shut the hell up."

"He’s distracted by the bottle," Tenya whispered, his lips moving against Katsuki’s shoulder blade. "And everyone else is asleep. We have the whole floor to ourselves. Why don't we put him down in the playpen and I can show you exactly how much I missed you today?"

A sharp, collective gasp shattered the silence of the kitchen.

Katsuki froze. Tenya’s hands stopped their wandering. Both men turned their heads slowly toward the entrance of the kitchen, near the sofa area that had been obscured by shadows.

Standing there, frozen in various states of horror and disbelief, were Izuku Midoriya, Ochaco Uraraka, and Shota Aizawa.

The coffee table was covered in board game pieces and half-eaten snacks. It was "Game Night"—an unscheduled event Aizawa had agreed to host to help the students de-stress. They had been sitting in the sunken lounge area, hidden by the high backs of the sofas, playing a silent game of strategy when the kitchen drama began.

Izuku looked like he had been struck by lightning. His eyes were wide, darting between the baby in Bakugo’s arms and the way Iida’s hand was still hooked into Bakugo’s waistband. "Kacchan?" he squeaked, his voice cracking. "Iida? Baby?"

Uraraka’s face was pale, her hands trembling. She had harbored a crush on the class representative for over a year, admiring his discipline and his morals. Seeing him talk about "filling up" their rival was a psychic blow she wasn't prepared for. "Iida... you... you said you were going to bed early because of your study schedule."

Aizawa was the only one who didn't look surprised, though he did look incredibly annoyed. He sat on the sofa, rubbing the bridge of his nose. "I told you two to be more careful. I didn't expect you to start discussing reproductive plans in the communal kitchen during a sanctioned game night."

Tenya didn't move his hands. If anything, his grip on Katsuki tightened, his protective instincts flaring up. The "Class Rep" persona was gone, replaced by the man who had spent the last year secretly building a life with the most volatile boy in school.

"Aizawa-sensei," Tenya said, his voice cold and steady. "I believe we had an agreement regarding our privacy."

"The agreement was that I wouldn't expel you for breaking dorm rules as long as the child was cared for and your grades didn't drop," Aizawa sighed, standing up. "I never agreed to keep your classmates out of the kitchen when they get hungry for midnight snacks."

Katsuki, finally finding his voice, felt the familiar heat of rage bubbling up to mask his intense embarrassment. He shifted Katsuya to his other shoulder, shielding the baby’s face from the bright light Izuku had just flicked on.

"What the hell are you extras looking at?" Katsuki barked, though the effect was ruined by the way he gently bounced the baby to keep him from crying. "Yeah, he’s mine. And the nerd’s. You got a problem with that, Deku?"

Izuku’s mouth opened and closed like a fish. "No! I mean—Kacchan, you have a baby? A seven-month-old? That means... during the provisional license exams... during the war... you were..."

"I was doing my damn job," Katsuki snapped. "And Iida was doing his. We don't need your input."

Uraraka stepped forward, her eyes watering. "But Iida... you’re so... you’re the Class Rep! You always talk about following the rules! And the way you were just... talking to him..." She blushed furiously, unable to repeat the words.

Tenya straightened his posture, pulling Katsuki flush against his side. "My personal life and my duties as a student are separate, Uraraka-kun. I love Katsuki. I love our son. If that contradicts your image of me, then perhaps your image was incomplete."

"Incomplete?" she whispered. "You sounded like a... like a..."

"Like a man who loves his partner," Tenya finished firmly.

Katsuya chose that moment to let out a loud, hungry wail. The sound cut through the tension like a knife. Instantly, the "scary" Bakugo disappeared. He turned back to the bottle warmer, checking the temperature on his wrist with practiced ease.

"Shh, Katsu, I got it. Calm down," Katsuki cooed, his voice dropping back into that soft, fatherly tone. He popped the bottle into the baby’s mouth, and the kitchen fell silent again, save for the sound of rhythmic sucking.

The sight was surreal. The two most unlikely people in the class were standing in the kitchen at 3:00 AM, acting like a married couple of ten years.

"How long?" Izuku asked, his voice small. He looked crushed. He had spent years trying to catch up to Bakugo, thinking he was the one who knew him best. To find out Katsuki had an entire family under his nose was a devastating blow.

"Long enough," Katsuki said, not looking away from his son. "Aizawa-sensei helped us get the side room in the faculty wing for the nursery. We take turns. During the day, we’re students. At night, we’re parents. It wasn't your business then, and it isn't your business now."

"It becomes my business when the noise wakes up the entire floor," Aizawa muttered, though there was a flicker of something like pride in his tired eyes. He looked at the two boys—men, really—who had grown up much faster than anyone had intended. "Midoriya, Uraraka. You will not breathe a word of this to the rest of the class. If the press finds out a UA student has a child, it’s a security nightmare."

"We won't tell," Izuku said, his gaze lingering on the baby. "He... he has your eyes, Kacchan."

Katsuki’s shoulders relaxed just a fraction. "Yeah. He’s got the nerd’s legs, though. Kid’s gonna be a runner."

Tenya smiled, a genuine, soft smile that Uraraka had never seen before. He leaned over and kissed the top of Katsuki’s head, then leaned down to press a kiss to the baby’s forehead. "He’ll be a hero. Just like his parents."

Uraraka looked away, her heart aching, but she couldn't deny the sheer devotion in Iida’s eyes. He wasn't the rigid robot she thought he was. He was a man who had found his anchor in the most turbulent person in their class.

"Go back to bed," Aizawa ordered, waving the two stunned students away. "The game night is over. And you two," he pointed at Bakugo and Iida, "finish feeding him and get some sleep. You have combat training at eight."

"Yes, Sensei," Tenya said, reverting momentarily to his formal self.

As the others filed out of the room, Izuku took one last look back. He saw Bakugo leaning his head on Iida’s shoulder while the baby finished his bottle. The kitchen was quiet again, the secret finally out in the open, at least for a few.

Katsuki looked up, catching Izuku’s eye. He didn't glare. He didn't yell. He just gave a small, weary nod.

"Goodnight, Deku."

"Goodnight, Kacchan," Izuku whispered, closing the door behind him.

Back in the kitchen, Tenya slid his hand back to Katsuki’s waist, pulling him close. "Now, where were we, darling? Something about a sibling?"

Katsuki snorted, shoving Iida’s face away with one hand while holding the baby with the other. "Shut up, Tenya. You’re doing the dishes for a week for letting them sneak up on us."

"A fair trade," Tenya laughed softly, his eyes dark with affection. "As long as I get to hold you when the sun goes down."