She is going to kill the other woman for sure, look at her reaction when yarizo says that the female bandit wanted jimmy, she wanted her dead lolYeah this game will cater to a lot of fetishes, it's not a strictly NTR game. Hell you can go through the entire game just headpatting the priestess if you want. There are multiple other woman that the protagonist can fuck, though I'm guessing if you're caught fucking these women there's going to be some consequences because the heroine is shown to be pretty batshit insane when it comes to other women getting close to the protagonist.