Chapter Text
“Oi, hurry up in there, Deku! You’re going to use up all the hot water!” Katsuki shouted, angrily pounding on the bathroom door. “It hasn’t been that long! Wait your turn like everybody else does!” Izuku exclaimed.
Katsuki growled and clenched his fists. “What was that, you fucking twerp?! Get out of the damn shower right now or I’ll drag your sorry little ass out myself, you little-Ouch! Dad!” He exclaimed as he felt a swift swat land on the seat of his pants.
“Katsuki, I don’t want to have to wash your mouth out with soap this early, but I won’t hesitate to if you keep it up.” Shouta said tiredly. Katsuki scoffed and crossed his arms, grumbling something under his breath as he looked away.
Shouta tilted the boy’s chin up, sternly looking him in the eye. “Sorry, what was that?” He demanded. Katsuki gritted his teeth. “Nothing.” He huffed. “That’s what I thought. Now, go wait for Izuku to finish his shower elsewhere.” Shouta said.
“What fucking ever.” Katsuki grumbled, shoving his hands into his pockets. Shouta effortlessly grabbed his son and held him under his arm.
“On second thought, you can go wait in a corner in your room. Apparently you need some time to think about that attitude of yours.” He said, landing quick, stinging swats to the boy’s backside.
Katsuki winced and kicked a leg back in pain, instantly regretting being born with such a smart ass mouth.
After a few more well placed smacks, Shouta stood Katsuki back on his feet and popped him once more, sending him on his way. “Go on, get moving.” He said.
Katsuki growled and stomped across the hall to his room, closing the door behind him. He thought about being defiant and not standing in the corner, but he knew that Shouta would definitely find out.
“Stubborn boy.” Shouta sighed as he watched Katsuki walk into his room. After Izuku had finished his shower, Katsuki grumpily stomped into the bathroom and took his own.
Hizashi continued cooking breakfast. “Sweetheart, can you hand me the butter?” He asked.
Shouto grabbed the butter and gave it to Hizashi, grabbing the carton of apple juice as well. Hizashi smiled and placed a kiss on the boy’s forehead.
“Thanks, honey!” He exclaimed. “You’re welcome.” Shouto nodded, grabbing a cup to pour his apple juice in.
“Hey Pa, can Kaminari come over tomorrow?” Hitoshi asked. “Of course your boyfriend can come over, Toshi! What time? I need to know so I can make some snacks.” Hizashi said, flipping a pancake. Hitoshi’s cheeks heated up.
“Paaa! He’s not my boyfriend! He’s just a friend.” He groaned. “Did Hitoshi just say boyfriend? Is Kaminari coming over?” Shouta asked, walking in and wrapping his arms around Hizashi. Hitoshi facepalmed and sighed hopelessly.
“I remember when I had a boyfriend. He was the hottest guy I’ve ever laid eyes on. Don’t you think so, Hizashi?” Shouta asked, placing a kiss to his husband’s neck.
Hizashi chuckled and turned around after turning the stove off, wrapping his arms around the other man’s neck. “I know someone even hotter…” He said flirtatiously.
Shouta smirked and whispered something even more flirtatious into his husband’s ear before trailing one hand down to Hizashi’s ass, letting it stay there.
Hizashi laughed loudly, blushing bright red. “Shouta!” He exclaimed.
Suddenly, the moment was ruined by a disgusted, irritated, wet haired blonde walking into the kitchen. “Would you two cut it out before we puke all over our breakfast?! It’s nine in the morning for fuck’s sake!” Katsuki exclaimed.
“Language, Katsuki.” Both men scolded.
“Come on, Kachan! You have been on it for the past three hours! It’s my turn!” Izuku complained as Katsuki continued watching a video on the family computer. “Scram or go cry about it, brat!” Katsuki hissed at him.
Izuku felt tears immediately springing to his eyes. He was a very emotional and sensitive person, he always had been. Combined with being the youngest brother at age 14 while the rest of them were 15 and 16, he was nicknamed the ‘baby’ of the family.
Izuku was still in class 1a with the rest of his brothers, as he had skipped a grade, making him, along with Uraraka who had also skipped a grade, the youngest person in his class. Katsuki was the oldest at age 16, then Shouto and Hitoshi at age 15, and last but not least, Izuku.
Being the youngest often got him plenty of sympathy from the family, Katsuki included. Although the two fought often, Katsuki was extremely protective over his younger brothers, especially their youngest one.
‘Why’d you go and do a stupid thing like that for, dumb ass?! You could have gotten hurt!’
‘I don’t care if you don’t like it, you aren’t going. It isn’t safe, and if I find your little ass over there, you won’t have to worry about answering to dad and pa. I’ll whoop your ass myself. Got it, ya’ little shit?’
‘Ugh, let me see it. Stop crying and go get me some super glue so I can fix it.’
‘Stay close to me and don’t wander off, or else.’
‘Who made you cry?! Tell me who the fuck it was right now! I’ll kick their sorry fucking asses!!!’
These interactions were very common when it came to Katsuki and Izuku.
Although they couldn’t stand each other a lot of the time, they also couldn’t stand to live without each other.
“Kachan! Stop being so mean and let me use it!” Izuku exclaimed, trying to reach past Katsuki and touch the mouse. Katsuki kept him away and gritted his teeth.
“Oi, cut it out you little shit! I’m not done using it, so deal with it! It’s just like with you and the shower this morning!” Katsuki barked.
Izuku crossed his arms and glared intimidatingly at his brother, though he honestly just looked like a little kid pouting to the rest of his family whenever he did that.
“That’s not the same thing and you know it! I hadn’t even been in there for that long! You’ve been on the computer for over three hours!” Izuku yelled.
“What’s wrong, Deku? Gonna cry and go run to daddy and papa to tattle on me?” Katsuki teased. Izuku clenched his fists tightly, and before Katsuki knew it, he was on the floor along with the spinny chair he was sitting in.
He growled at Izuku, holding his now pink cheek. He angrily stood to his feet and the two boys began fighting, physically this time. The loud sound of them bumping into things alerting the rest of the house.
Before they could even notice their parents walking in, they felt themselves being pulled away from each other. They continued yelling at each other as they were held back, neither of them listening to Shouta telling them to stop.
Shouta’s patience had worn out. “ENOUGH!” He shouted, causing both boys to fall silent. “Why the hell are you two fighting?” He demanded. After both boys angrily told their side of the story, Hizashi and Shouta moved to stand in front of them both.
“You two know better than to get into physical fights with each other. I know that it is natural for siblings to argue, but it is unacceptable to physically fight each other.” Hizashi lectured. “Yes, sir.” Both boys answered, looking down at their feet.
“Who hit first?” Shouta demanded. Izuku felt tears immediately spring to his eyes. “M-me…” He whispered softly. “Eyes up, young man.” Shouta said, lifting the boy’s chin. “M-Me, sir. I h-hit him first.” He confessed.
“Alright then, you’re getting extra. If there was an issue that you two couldn’t resolve, you both know to come get one of us and let us handle it.” Shouta said.
“Yes, sir.” Both boys answered together once again. Shouta sighed and walked over to the couch, taking a seat on it and rolling his sleeves up. “Izuku, come here.” He said, motioning the boy over with his finger and pointing to the spot directly in front of him.
Izuku slowly walked over to the spot and stopped in front of his dad, sniffling. Shouta tugged Izuku’s pants and underwear down to his knees and laid the petite boy over his lap, resting a hand on the small of his back.
Meanwhile, Hizashi sat down on the desk and bared his protesting son’s bottom before laying him over his lap. “Come on, pa! I’m too old to be over your knee!” Katsuki exclaimed, struggling over Hizashi’s lap and kicking his legs.
“Ah ah, you cut that out right now, little boy. You will never be too old to put over my knee as long as you continue to behave this way. I am very disappointed in you, Katsuki. You are the older brother in this situation and you provoked the actions of the fight instead of trying to de escalate the situation.” Hizashi said, resting a hand in the blonde’s spiky hair to both provide him comfort and keep him still.
Katsuki blushed bright red as he was referred to as a ‘little boy’. He hated it when his parents called him that, even if he was acting childish! Hizashi words had stung quite a bit. “I get it, I’m a disappointment! You should have expected this when you adopted me!” Katsuki shouted.
Hizashi gritted his teeth and began landing hard swats straight to the boy’s sit spots.
“Say that again and I will make you write ‘I am not a disappointment’, along with other true and positive things about yourself, 500 times. I’ll also give you a bedtime spanking on top of the spanking you will already be receiving for saying those self deprecating things. Do I make myself clear, Katsuki?” He demanded sternly.
Both he and Katsuki knew that he wasn’t bluffing in the slightest. “Yes sir!” Katsuki yelped out. The hard swats stopped after another 10 landed on his sit spots.
“Good. Now, you know that what you did was wrong and that physically fighting you brothers is unacceptable, so I think you need a reminder of what will happen every time you decide to do it, hm?” Hizashi said, patting the boy’s bottom to let him know that he was about to start.
Katsuki groaned and buried his face into his arms. ‘This. Sucks.’ He thought bitterly.
Meanwhile, Izuku was frantically pleading with Shouta in hopes of getting him to change his mind about spanking him. “Please, dad! I-I’ll do the dishes all by myself for a month! You can confiscate my comics! I-I’ll…” He desperately pleaded with the man, covering his bottom with his hands.
“Yamada-Aizawa Izuku, move your hands. Right now.” He demanded sternly. Izuku let out a soft sob and moved his hands, holding onto a nearby pillow for comfort.
“Now, you are going to lay here and think about why I am giving you this spanking.” He said, smacking Izuku’s bottom and alternating between the two cheeks. He was more of a technical spanker, while Hizashi had the heavier hand.
“Owww! Ow oww! Ouch! Daddy! Please!” Izuku wailed out, tears immediately rolling down his cheeks. As much as it pained Shouta to hear his little boy crying out, he knew that he had to learn.
He continued spanking the quickly pinkening bottom over his knee, knowing it wouldn’t do him any good if he eased up on him and let him off the hook.
After a while, Katsuki couldn’t hold in his grunts and yelps anymore. “Ah! Ow! Dam-Dang it, pa!” He quickly corrected, not wanting to have a bar of soap in his mouth as soon as this punishment was over.
Silent tears rolled down his cheeks as he winced, his bottom feeling like Shouto had directly lit it on fire with his quirk. Katsuki honestly wouldn’t be surprised if Hizashi’s hand had actually hurt worse than literal flames.
“You know that what you did was wrong and why I am punishing you, so I am going to save the lecture and just focus on making this lesson stick.” Hizashi said, landing hard smacks to the rosey red bottom over his knee.
Considering the boy’s remorseful ‘I’m sorry’s that softly poured from his lips, Hizashi knew he had gotten through to him. He landed one more swat before quickly sitting the boy up on his lap, making sure his sore bottom didn’t touch anything.
“It’s alright, honey. It’s all over now. You’re forgiven. It’s okay. Shhh, take deep breaths. There you go. Good boy. It’s okay.” Hizashi whispered softly, stroking Katsuki’s hair and pressing a gentle kiss to the boy’s forehead while rubbing his back comfortingly.
Katsuki couldn’t help but wince at the sound of his younger brother’s backside receiving hard swats from his dad’s hand.
Hizashi continued to gently rock him in his arms. No matter how old the kid got, he’d never be too old for his father’s affection and comfort. Hizashi would always provide his family with both.
“Why are you receiving this spanking, Izuku?” Shouta asked, needing to hear that the boy had truly learned his lesson.
“For f-fighting with K-Kachan! Owwwww! Ahhh! Daddy! I’m sorryyy!” Izuku cried out loudly as sharp smacks rained down upon his backside.
“That’s right. You two are family, physically fighting each other is never okay. Arguing is bound to happen, but if you two physically fight each other again, I will make this spanking feel like a walk in the park. I will not put up with you two hurting each other. Do you understand me, young man?” Shouta asked.
Izuku was bawling his eyes out. “Yes siiiiiir!” Izuku wailed. Shouta gently rubbed the sobbing boy’s bottom, giving him a chance to rest for a second. “You know I have to give you extra for starting the fight, right?” Shouta said glumly, stroking the boy’s hair.
Izuku cried and shook his head. “P-please, Daddy! N-no more!” He sobbed. Shouta's heart broke as he heard his baby’s cries, and it took everything in him not to immediately pick the boy up and coddle him.
However, he knew that he had to follow through with his promises. So, he braced his heart, stood the boy up between his knees, held him against his body, and swiftly peppered the boy’s red backside with smacks. Izuku yelped out in pain in between sobs, his cries muffled by Shouta's shirt. “Owwwwww!” Izuku sobbed, wrapping his arms around Aizawa for comfort.
“I know, I know. Just a few more, baby.” He whispered, gently rubbing the boy’s back. After a few more swats, it was all over. Izuku immediately threw his arms around Shouta's neck and wrapped his legs around him as he sat on his lap and cried into his shirt.
“I’m sorry, daddy!” He wailed, shaking with sobs. “Shh, you are forgiven. It’s okay.” Shouta said, rocking Izuku in his arms until the boy had stopped crying
“I hope you two have learned your lesson.” Hizashi said, using his thumb to wipe away Katsuki’s stray tears.
“Yes sir.” Both boys said in unison. Fortunately for them, Hizashi and Shouta wholeheartedly believed them.
Sometimes after one of their kids received a spanking, they had them stand in time out with their pants and underwear down around their ankles, both as a reminder of their place, and that their parents wouldn’t hesitate to swat them again if they acted up. They weren’t allowed to rub their bottom’s either, so they had to place their hands on their heads, making it easier for Shouta and Hizashi to tell if they had tried rubbing.
Luckily, the two boys didn’t have to worry about that this time and could immediately receive all of the comfort that their father’s were spoiling and showering them with.
“You know we hate having to do that to you kids, but we will not tolerate these kinds of actions.” Shouta said, gently rubbing Izuku’s head and resting his hand in his green, fluffy hair. The youngest nodded sadly, sniffling and holding onto Shouta's shirt.
“W-we’re sorry, daddy.” He whimpered softly. “Yeah.” Katsuki said, leaning into Hizashi’s warm cuddles and head rubs. “I think you two should apologize to each other, too.” Shouta said.
Katsuki and Izuku both made eye contact as Izuku turned around to speak to him. “I’m sorry for hitting you and for fighting with you over the computer.” Izuku said sincerely to his oldest brother.
“I’m sorry for fighting you and provoking you.” Katsuki apologized. Izuku smiled softly while Katsuki gave him a nod. Hizashi began kissing Katsuki all over his face. “Paaa!” The blonde boy exclaimed, blushing bright red. He wasn’t a baby, damn it!
Meanwhile, Shouta placed a kiss on Izuku’s nose, causing the boy to giggle. “You little troublemakers will be the death of me.” Shouta said, instinctively bouncing the boy on his knee, a habit he had picked up years ago when he first became a father.
“At least you can say that you lived an exciting life.” Izuku said. Both Hizashi and Shouta chuckled at the boy’s comment. Even Katsuki couldn’t help smirking at his brother’s response. ‘Little shit...’ He thought.
Later on, Katsuki laid on his stomach on his bed as he scrolled through his phone. Then, the door opened. He looked back to see his youngest brother standing in the doorway.
“Hi, Kachan.” Izuku said, closing the door behind him and walking over to the bed. Katsuki growled and glared at him. “Oi, how many times do I have to tell you to knock?! It’s common courtesy, brat!” He yelled, though there were quite a few times when he had barged into his siblings rooms without bothering to knock.
“Sorry…” Izuku apologized, scratching the back of his head sheepishly. Katsuki scoffed and returned his attention to his phone. “Whatever. What the hell do you want?” He asked. Izuku walked to the other side of the bed and laid next to Katsuki on his side.
“I was bored.” Izuku said with a frown. Katsuki rolled his eyes and turned to lay on his side as well, meeting his brother’s gaze. “What the hell do you want me to do about it, huh?” He asked. “I don’t know, just let me stay here with you.” Izuku said.
Although Katsuki’s brothers annoyed the absolute shit out of him, he still cared about them. “You want some attention, eh? You spoiled little brat. You slap me in the face and now you want my company, is that right? ” He said, moving Izuku closer to him and gently ruffling his hair.
Izuku looked up at him and whined. “I’m not a brat, Kachan! You’re just mean!” He exclaimed. Katsuki rolled his eyes and rubbed Izuku’s back. “Oi, you’re lucky I don’t whoop your ass myself after what happened.” He said.
“You deserved it and you know it.” Izuku replied with a smirk. “Watch it, ya’ little shit. I’ll have you over my knee quicker than you can blink.” Katsuki scolded playfully.
“I should spank you for being a grumpy old man.” Izuku joked. Katsuki wrapped one arm around him and rested his chin on top of his brother’s head while he used the other hand to scroll through his phone.
Katsuki rolled his eyes. “Yeah, as if you could. I’d have your ass bared and over my knee before you could even try it.” He said. Izuku simply huffed and buried his face into Katsuki’s chest, accepting defeat. Big brothers could be so mean!