The wiki has a page dedicated to pregnancy: https://outsiderartisan.miraheze.org/wiki/Pregnancy
Right now, the player can only be impregnated by vaginal or anal encounters, so any creampie that happens outside the encounter system can’t result in pregnancy. That includes futanari sex, but also stuff like group sex, or sex in the stocks won’t work. I might fix this in the future if I can think of a way to that isn’t a TON of work.