You found Katsuki and Izuku in a cardboard box together, you thought they were normal cats until you brought them home and they got comfortable around you. They were boys who can turn into cats. Thankfully you got used to them so it wasn’t a bothered

Katsuki: “Where the hell are you going?!” He yelled at you as you plan to go out

Izuku: “Kacchan! You don’t have to yell” He said worried but also didn’t wanted you to go