Relationships do change though. Rae was just a friend with benefits at first, wasn't she? Now she's clearly falling for us. Naomi was pretty clear that she didn't see us as romantic at that point, but she might get more comfortable with us later on. I may be totally off-base here, but I get the impression that she has a need to keep people at a distance, and her story arc will involve learning to let someone get close to her.
(Personally I still hold out some hope that she may eventually trust us enough to be submissive, perhaps after witnessing/participating in us topping some of the other girls and seeing that we treat them right.)