The girl you saw at the start of act 2 is the antagonist of the act. And yes, she is tied to all the girls stories in act 2 like Lenya
hopefully there will be a chance to enslave her at the end but i think it would be cool if there was a different enslavement for each antagonist like a love potion i don't necessarily mean a love potion in general it could be anything really and can i ask you something will that princess like girl the one that tried to kill cecelia be the one to save this time around i think she would make a perfect main girl