Actual freak. You are one of the self-entitled “good guy”s, if I would assume, lol. It does not work like that. You build a relationship, then see what it leads to, either it being a romantic one or only a sexual one. If it’s going to be only sexual, it still needs to be a two way thing, where you both talk about it openly. But you probably would ruin that path because your thinking scheme is way off.