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Katsuki Bakugou made many mistakes in his life. That includes messing up his first marriage with Izuku Midoriya. He doesn't know why he did what he did, he just know it didn't feel right. And so he cheated, he cheated on Izuku and for the worst of it he cheated on him with his best friend, Eijiro Kirishima.
Izuku remembers when he caught his husband in bed with his best friend, the two had been sleeping but the clothes on the floor says otherwise of the situation. Immediately, he writes a note for Katsuki before packing his things along with the kids things then dashing out of the poor. The twins were confuse, who would want to see their papa cry while holding onto them tightly.
Izuku filed for divorce after that. He couldn't even look at Katsuki in the eyes after witnessing the cheating incident. Unfortunately, Katsuki had the right to have custody of one of the twins, he ended up taking their daughter Haia, while their son Isamu stays with Izuku.
Katsuki and Izuku (when they were still married) trained the twins once their quirks came in. Haia has a quirk called "telekinesis explosion" she can make any objects explode with her mind, though the larger the object gets the painful her migraine. Isamu was a late bloomer, getting his quirk at age 8, the year of the divorce. It was when he caught his fathers fighting when it came. Isamu has a quirk called "ignite" he can basically lit anything on fire with a touch of his hand.
But once they did divorced, they had to tell the twins. The twins didn't understood the situation, not until they were 11 years old when their Papa (Izuku) explained why. But it wasn't until they were 13 when Haia found out from Eijiro that their Dad cheated on their Papa with him. Haia hated her Dad since then, lost the respect for him and she told Isamu a year after causing her twin to do the same.
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[ Bakugou household ]
As the current Number Two hero: Ground Zero. Katsuki tries to keep his private life quiet, especially since the divorce, he can't have his children being treated badly because of him. Though its a little too late as the twins started treating him differently since they found out.
Haia stepped out of the bathroom combing her hair as she gets ready for school. She wore the typical U.A high uniform with her hair tied to one side of her head. She wore her shoes and quickly head down the stairs. She saw Eijiro in the kitchen with her dad, scoffing she turned around and left the house, slamming the door in the process.
In the kitchen, Eijiro flinches at the sound of the door slammed shut. He sighs looking at the breakfast plate he made for Haia only to be left cold... again. Katuski angrily looked at the counter as he drinks his coffee.
"What are we going to do with her?" Eijiro frowns, pushing the plate towards his husband.
After the divorce, Katsuki proposed to Eijiro two years later, they were a happy family along with Haia, she even called her Daddy but after finding out the dark truth. Haia just ignored his presence. Even Katsuki.
"I'll talk to her" Katsuki says.
"She'll yell at you again and this time maybe even use her quirk. Haia's angry at us Katsuki"
"I know"
"Want me to text Midoriya?" Eijiro asks.
Katsuki shook his head. "He'll just say its my karma"
"Katsuki... I want a baby" Eijiro shyly says.
"What?"
"A baby, I mean I love Haia but I want a child on my own you know. Maybe she'll be happy about a sibling?"
Katsuki smiles. "Of course babe, I would love to have a child with you"
[ Todoroki Household ]
Being married to the current Number One hero is something else, half of the time Shouto was in charge of the twins when Izuku was called to a mission or has to send somewhere far. He is practically their dad more than their dad. But that doesn't mean he'll let them disrespect Katsuki, no matter how much he deserves it.
Isamu yelps as he feels someone jump on top of him, opening his eyes and looking up, he sees his twin smiling down at him. He quietly groans in annoyance before standing to head to the bathroom. Haia made her way down the stairs where she sees Shouto sitting on the couch, she smiles and jumps landing across his lap.
"Hi Sho~" Haia giggles.
"Good morning Haia, did you eat breakfast?" he asks.
"Nope. I left the house before Eijiro and Katsuki saw me" she said.
Izuku enters the living room and sighs. "Princess, how many time do I tell you to call Katuski "dad" and not his actual name?"
"Lots but I don't care. I'd rather call Sho "dad" than that cheater" Haia scoffs.
"Haia please" Izuku says hugging his daughter. "I know you feel resentful towards your Dad but he's trying to make up with his mistakes"
"Maybe he should have thought of that before cheating with Eijiro! So much for being a freaking Number Two hero!" Haia exclaims.
"I agree Papa" Isamu says coming down from upstairs. "If Dad didn't love you anymore, he should have said it and not cheat. It's common sense but I guess he doesn't have that"
"Okay, the two of you in the kitchen right now! And Sho, get the car ready to take them to school" Izuku sighs.
Entering the kitchen, Izuku looked at his children and sighing, this was Katsuki's karma. Both of his children hate him. And they are making it obvious.
"Listening you two, I know it hurts. I know. But Katsuki is your Dad and he will always be. He's making up his mistake to you guys. We've both moved on, we both married someone else we love and it's okay" Izuku explains. "Yes it's immoral to cheat, but that isn't a reason to hate your Dad"
"I'm sorry Papa, but Katsuki doesn't deserve the title Dad. He had two children and a happy marriage. But he ruined that because he wants to fuck his best friend... I can never live with a man like that" Haia says before walking away.
"I'll calm her down Papa" Isamu mutters.
"Here's money, buy her something spicy will you?" Izuku says handing his son some cash.
"Yeah..."
"Oh and Samu?"
"Hm?"
"Do you love your Dad?" Izuku asks.
Isamu shook his head. "I love you more Papa, if I had a choice, I wouldn't be heading there on weekends"
The drive to school was quiet. Shouto didn't know what to say to the twins, even though he agrees that Katsuki is an asshole for cheating, he at least deserve the twins respect. But that's his karma and there's nothing they can do about it.
School went on as normal. The twins amazingly got Aizawa as their homeroom teacher and immediately referred to them as "problem children" knowing that the two are from his previous problem children. But while the twins are in school, Izuku went to meet up with Katsuki about the situation with the twins. They met up at the nearest cafe shop nearby.
Izuku entered the cafe immediately seeing Katsuki sitting by himself while sipping his coffee. He sighs and approached his ex-husband, quietly saying hello before sitting.
"I got you tea" Katsuki says pushing the other drink towards Izuku.
"Thanks"
Awkward silence.
"Why am I here Deku?" Katsuki says a bit annoyed.
"How was Haia this morning?" he asks. "Anything happened?"
"I didn't see her. She ran out this morning before we could say good morning" Katsuki mumbles.
"Kacchan, she ended up at my place again"
"I know"
"She can't keep doing that. She basically lives there at this point. I love Haia, but according to law she still has to live with you"
Katsuki tisked. "Listen Deku, the kid hates me and refers my first name instead of "dad" I can't do anything anymore"
"So giving up on your daughter is the best thing to do? Like you gave up on our marriage?"
"I- How many time do I have to say I'm sorry?"
"Even if you do. I will never forgive you" Izuku says. "But giving up on your son and daughter is another thing"
"I'm not giving up. I'm giving them space"
"It's been a year Kacchan..."
Katsuki stands up and scoffs. "They'll get over it" and walks away.
Does Katsuki regrets cheating? Absolutely, he could have done it another say, break it off before fucking his best friend. But he didn't and for the rest of his life, he'll have to live with it. But will he be able to?