I can't phantasize about something unrealistic. Let's say I want to imagine me and my crush making out. I can't just do that. I have to make up a whole story first, about him breaking up with his girlfriend, an exchange student coming to our class who becomes our mutual friend so we get to know each other, and other wild things that make it a bit more realistic. I hate it, because sometimes I end up making up such a story for so long that I don't even get to imagine the actual making out.