I think that in the next episode the main five will be hostile to Zoey on all routes where the MC decided to return to her. Yes, even if it is the MC of others. The reason is the story that the MC told Bella in season 1. From Bella's point of view, Zoey is the MC's ex-girlfriend, who for no apparent reason dumped him, stopped communicating with him and got herself a new boyfriend.
Of course, Bella will be worried. I think she will tell this version of the story to Sage, Josy, Maya and Jill. We have already seen what Sage can be like in Lily's route. Zoey will have to work hard to prove to the MC's friends that she is trustworthy.
I think that players of the other branch will be able to fuck Bianca, but I doubt that she will become a girl with whom it will be possible to finish the game. There will not be enough time to build a relationship, even if there are 16 episodes.