>>718933940
>imagine viewing the other girl as competition
Why shouldn't you? There's always one girl you subconsciously prefer more than the other in a pairing, so you're losing out by foregoing self-inserting in favour of imagining your waifu with a girl you like less. If there's no male surrogate to project onto, and the subject of affection (girl #1) has her sights set on another, inferior girl (girl #2), how can you, yourself, engage in the escapist fantasy of making babies with your waifu? Where does the sexual excitement of imagining two girls together come from? And why do you find it better than imagining yourself in those same scenarios with your girl of choice? The appeal of yuri is voyeuristic, almost to the point of self-hatred, in the sense that even your sexual fantasies preclude you from participation. People who like lesbian and yuri porn are sad.