That's You're roomate's sister
Ok the girl in the bed is Vin's sister Which I am now assuming is the girl that kept the apartment paid and clean while Peter was in another dimension with the Fantastic Four I have on issue even if you you both don't seem to get along and get drunk at a wedding and end up sleeping together that's fine but if you sleep with you're roomates sister while he is in jail you might want to start to look for another place to live