Were LIs even as explicitly defined as they are in BaDIK?
Point being, even if Quinn isn't a love interest, does it mean the MC therefore cannot have any kind of future with her?
My expectations of this game are that there probably isn't a long term future with a lot of the LIs (Jill and Sage will be out of the MC's life soon enough, unless they make the effort not to be, and Bella...). So while not long term, the MC could still end up in a relationship with Quinn until she graduates and moves on too.