Thorki human au where they were homeschooled and raised in a very isolated cult (the cult is called Asgard's Joys and they're a weird ass vaguely Norse pagan group, but also like weird fucking Christian shit mixed in.) they're weirdly puritanical and when Thor and Loki go through puberty they cut off all access to the outside world because they feared they'd get into sexual situations with other horny teens, but since they're both so horny and pent-up and don't know that incest is wrong, they start fucking each other. (Also they're blood cousins in this but raised as brothers). And when the cult finds out they force them to marry because "Sex outside of marriage is worse than incest" and then force Loki and Thor to fuck every day without condoms or birth control until Thor gets pregnant (yeah ftm Thor. They're weirdly puritanical but trans positive) because they need more babies for the cult. They need more followers, and people keep leaving because of *looks at long list of insane crimes* no reason! And everyone is so excited but little teen Thor and Loki are horrified. They don't know what's happening. They thought babies came from storks until Frigga sat them down and explained to them the birds and the bees, and the miracle of life.
Thor asks if he can get rid of it, if there was a way to (they never taught either of them about contraceptives or abortion) and they say no. So now Thor and Loki are teen parents, Thor's stomach is getting bigger, and he feels like shit all the time. To make it even worse, giving birth in the woods with no anesthesia. He has his mother, brother, and midwife there, but nobody else. When he rips open his vagina they sew him back up and hand him his baby to breastfeed. Congratulations, we know you're in pain, but here's your baby.