I think an interesting mechanic for future chapters of the game would be to allow corrupting Aura's friends next (i.e., rooms for them being added on to Aura's). Perhaps Richard's souleating created a crack in their psyches or something, or Alicia starts corrupting Aura to corrupt her friends.
For example, if Aura "lost" the first game, she could have the choice to help Richard/Alicia corrupt her friends too, or secretly undermine Richard/Alicia to spare her friends her fate (and potentially fail them, resulting in NTR?). And if Aura won the first game, perhaps Alicia could start over on Aura's friends as revenge on Aura; Aura could then be dragged down with them this time, or could keep them pure too by fighting the changes.
Or the friend corruption storylines could even be added to the current story. I.e., as Aura closes in on Richard, Alicia and Richard realize she's drawing strength from her friends (pure playthrough) or her friends are intervening to reverse her corruption (lewd playthrough), and so Richard/Alicia decide to corrupt the friends too.
As an aside, I've always been curious why Aura hasn't told her friends about this game she's in (and they were in). I feel like there has to have been an explanation, but I missed it. If not, having them get involved would be a nice plug for the hole. E.g., Aura realizes she needs help and explains everything to them, unwittingly making them targets too.
Anyway, the intricate corruption mechanic is my favorite thing about the game. I miss it already, even with the first game not finished yet.