Hentai where the father is a slender, clean shaven, feminine man. His son is a young bara. They have anything goes sex all the time. This needs to be more common in hentai, I don't think I've ever seen this, closest to it was with big brother but not father.
Tfw you think a guy is cute and gay but you can't be sure so you flirt with him anyway but you can't tell if he's going to figure it out or just going to be oblivious and think you're a "nice" friend. Can't just ask him if he's gay, that would be weird.