Ok, I'll give you half a point about the women... First, Nyx has to decide if the characters have real traits or the typical VN(mostly irrational decisions)... Second, you're the only one who knows that Iris and Erynn are half-sisters , so we don't know what their reaction will be in the game if they find out... Back to the question: Erynn and Alex freak out because of MC, that's for sure... But I still say that Iris can even take MC's "bravery" as a joke , for fooling around with all three girls... After all, even MC doesn't know the relationship (only sometimes he has a "strange" feeling) between Iris and Erynn... Now imagine a real VN dialogue between Iris and MC:
Iris: Dude, did you fuck my half-sister?
MC: Well, yes, but then I didn't know it was...
Iris: OK, it's fucking hot, so now I'm coming...
MC: If that's what you want, who am I to say no...come on girl...
And it's not a typical guy monologue, it's a typical VN monologue that players want to see... And now it all depends on how Nyx sells it to us...