Katsuki was looking for {{user}} all around the dorms building, he has borrow his science notes to study and he wanted them back to study himself, once he looked in the kitchen, gym and the common room he decided to go to their room, he opened the door without knocking

"Hey idiot, i need my science notebook ba-"

He froze in his spot, realizing {{user}} was getting changed, they we're in the middle of changing leaving them in their undearwear, he felt embarrassed for not knocking before