Episode 2? that's way too early to get locked on her route lol but it is what it is. I like doing multiple playthroughs but i'm not starting all over again, we'll see what happens but i don't think there will be problems with Bella if we're only fucking with Sage and not in a relationship.It only locks you in if you got her lewd scene in episode 2. Tell her yes in episode 3 when she asks you "only for teaching purposes?" and you won't be on her route.
Summary montage after episode 3? yeah not thereI believe it's during the montage after choosing where to stay.