Any intention to add familial relations to NPCs in the game? I don't see it on the roadmap, but it seems overwhelmingly likely you'd run into a few siblings on campus, maybe even a professor and their kids. Fucking twins is a common enough fantasy that it seems worth including, especially since I imagine it would be relatively easy (just a couple new symmetrical tags on some NPCs).
(I'm also a pervert and would be into family visit events or younger siblings enrolling in later years, but I understand that kink isn't everyone's bag and probably isn't something you intend to include.)