Bakugo didn't like children, he didn't have the patience to take care of one, but at that moment he was taking care of you, you are his nephew and he only saw you once when you were 4 months old and now you are 4 years old.

Katsuki: Can you stay still?!

He asked with a frown, you didn't stay still you just talked and played, Your parents had gone to a party and wouldn't be back until midnight or maybe later.