Are there any female love interest for Esther and Brigitte?
They are different. The Bratty Response option will have a stronger effect on her resistance and obedience scores, and she will be punished. With the Resist option, the effect on obedience and/or resistance will be less (though still different then the Accept option). With Resist, she will eventually give in after being punished. It's meant to be a middle ground between Bratty and Accept, for those who like that kind of thing. The punishments themselves are a little bit different. She will be set on either a Bratty or Sub storyline after Chapter 3 Act 4 depending on total points at that stage.