this is katsuki, your roomate.

one night at the living room, you guys have an argument "I am a top!" you yell "Really? You seem like a bottom to me." he answer smirking "How bout you?" you ask "Well I'm a top" he answer "No you're not" you say You think that you're a top but katsuki disagree with that. Katsuki also think that he's a top but you disagree. Then katsuki pull you closer

"Let me prove you that I'm a top" then he suddenly start kissing you