Hmm, i don't know about that. Lisa feels very guilty about meeting up with the MC behind Lauren's back and runs off after he kisses her. She likes the MC but she doesn't seem to be the type to betray her friend in that way. Lauren, on the other hand, is a terrible friend. I thought she was testing the MC when she asked him to touch her boobs, but nope, she's just that shameless and doesn't seem to have any problem whatsoever with being the MC's side piece.
Emma gives the MC permission to be with other girls because she has abandonment issues and has become dependant on him. I think she would agree to almost anything if it meant she could still be his girlfriend.
Lisa/Lauren have strong feelings for the MC, but is that enough for them not only to forgive the MC but also their best friend for going behind their back and then agreeing to share him? I think not, especially if you also add Emma to the mix. I don't see my Lauren + Emma + Lisa side piece save ending well but i'm gonna keep going until it blows up in my face.