The Vixen with smeared banshee make-up is the girl you see fucking with 2 dudes in the dorm party roam event. Not sure if she'll become a love interest, or at least be made available for fucking though.
What I said is not wrong, we have never really seen any of LI in action with anyone else, this is a fact that is unlikely to change, as it would touch NTR's line and would irritate 90% of the fans for no good reason.
And about Oscar's girls, I doubt any of them will become love interests, they are Oscar's prostitutes, their role is to be competition for Quinn's restaurant and add drama and pressure, we already had a conflict with Oscar during the party, and it's even possible that he was the one who attacked and robbed Quinn...
Neither Sarah nor Mel are considered LI, it's even less likely that the Oscar girls will become one.