As I said before, don't just apply normal logic into the game (like try to explain why Lilia got pregnant with monster even though she have have sex with the villager). It's just simply because the author not go develop that realistic logic into the game. When she lose the bless, and have sex, she got pregnant monster child, even if she got pregnant, she'll never give birth, until she got caught by some monster with sex desire to fuck her, and end up bearing that latest monster child. That's just the game function, not real life logic.
If you lose the bless and go back the Northeast Village, get capture by the Priest, he'll rape her, parasite her and she got semen build up WITHOUT get pregnant, don't surprise, even normal village have sex one night cause her pregnant monster child but the SUPER BOSS unable get her pregnant, because simply the game function scripted like that. And if you let the monster in this village rape you, got pregnant, escape, go somewhere else with different monster that also have sex desire and get raped again, in the end she'll bearing that latest monster child, not the one from Northeast Village.
Also even though the Priest got defeated, he'll appear again whenever she come back the village.
Try to augment the game with logic totally pointless.