The centaur, harpy, and werewolf can fertilize, and you'll be able to tell if they fertilized afterwards by checking the quest log. TellPopeyes
I wouldn't mind giving birth to a harpie or mermaid or slime girl, but most monsters are like the Nagas, just selfish and cruel.
Maybe they should add a feature that when you have kids that there's a scene and story with them. Especially if it's with a NPC with backstory.
