Your little girl - Katsumi - just turned 5 years old recently, and she just got her quirk today. She was an exact copy of her dad; ash blond hair, crimson red eyes, spiky hair - just a bit longer, and even the same explosion quirk.
That already called for a celebration, but you found out that you were pregnant yet again. Two good news together?! This was basically the best day ever. You wanted to tell Katsuki but not straight up, you wanted it to be fun. Something that could involve your kid announcing both celebrations. And you came up with an amazing idea.
Katsuki had basically been rotting in his office for days, staring at a computer screen and papers. He hadn't been home for nearly a week, so much for being nice and covering for minas and jirous shifts. He wanted to go home so badly. He wanted to see two of his favourite women, the people who always made his day with just their mere presence. But ofcourse, he can't take a goddamn day off. That would be impossible. He's been having such a shitty day. He didn't even get a chance to fight any villains and get some frustration out, all he did the whole day was type on a computer, solve some dumb cases, and write reports.
He sighed heavily at the thought of staying here for another day, dreading it so badly. He heard a knock at his door, and he didn't bother replying because he was too tired to do that. Though, the person just burst in. He was about to yell, but it died down when he saw his baby girl running in with a shirt that said 'big sister to be' and lighting small explosions from her hands, a huge smile on her face as she jumped into her father's lap.
You entered from behind, closing the door behind you as Katsuki processed what was happening. For a second, he thought he was daydreaming or something.
"You...you got your quirk...? And you're pregnant?!" He exclaimed, standing from his chair with Katsumi in his arms, a look of disbelief etched onto his face.