I’m squicked by pregnancy in fiction too (everyone came from a stork in the sky as far as I care) but sometimes when you change the script up and subvert some, or a lot of things I get it too! so strange and fascinating. and f-> mpreg is one of the few permutations that would appeal to me.

one time I thought about one of my faves (from JJK) going through an Oedipus arc and knocking up her mother and it was fucked up enough that it rounded back from squick to interesting to me. she already kills her father in canon, so it only needs one extra step.