I Don't Really Know A Lot About Love

"Last time I checked, she was almost as big of a fucking nerd as Deku." When told that his mother's old childhood friend and his family are moving back to Japan, Katsuki really couldn't be bothered to care. But the moment he sees their daughter for the first time in years, Katsuki knows immediately that she's going to be a big problem. (M for sex & swearing) -longer summary inside-