I think body-swap is definitely an avenue towards selfcest. Unfortunately (for me) I really really don't like it when bodyswapped characters get it on with each other before swapping back. I mean, closing their eyes for a few kisses and such is fine, but full-on sex and getting all turned on by their own body is just kind of a squick for me. (What does work for me in this scenario is masturbation because you're turned on by the body that you're in)

But I definitely agree that body-swap should be a trope on the list! I will probably add that one in a few days, but I will probably not rec a fic where they go as far as self-cest in it :)

Do you have any favorite body-swap fics?