The impression I'm getting for part 2 is that Dylan is going to be a more active protagonist this time around. I might be wrong, but playing around with the relationship points of Marie and Claire only affected the scene and dialogue concerning Dylan, which is what leads me to believe that Claire, Marie, Emma, and Christine are going to be more for Dylan.
In my full lesbian route for Sophia, in which I sent Dylan to the boarding school, there were no points in Emma's status. Seems like Sophia can only pair up with Patricia, Ellie, and Nathalie. Things may change in the future, but that's what I've noticed with the little we've been given so far.