Well if love triangles are a thing then I will probably have to make over 10 playthroughs once the game is finished...
Victoria is basically compatible with anyone but her with Maja and Mila will probably be the most wholesome. (my priority so far because I want her to walk again) + there's still Celina (her therapist)
Nami is apparently compatible with Bella
but she probably has the best connection with Nia and Mila.
Mila with anyone but Nia and Victoria could become surprisingly hard (even with them)...
If there's a domination route with Bella (that can go dark) I can imagine several situations with Zara and Nadja in a twisted form of revenge.
However she and Nadja and Ayua are already friends so there's that.
Amber is apparently impossible but it would kinda be a stretch anyway in a more realistic game.
She could probably be in a cougar/incest relationship with Claire (Bellas aunt)
Maybe there's a posibility with Nadja and Zara where the relationship turns into a rivalry between the two of them...
Nadja could probably also work with Sonya and her RPG-friend Nancy.
Sasha will probably be possible with Ayua and Robin and I agree that she with Bella would be hot but I don't see the connection yet. (maybe Sasha and Nami as they're the "undercover agents for blueballing" ^^)
I too think Sonya's hot but so far she has only a superficial connection to Nadja and Nami...