Petra is as important to Max as Emma is, and if they spend time together he would be fine with that; as for finishing inside her, what's the big deal Petra is a girl, remember she has all the girl parts but only one boy part, the penis, no testicles so no sperm, so she can't get Emma pregnant and even if they could i' sure they would welcome petra giving emma a baby!; Max took Perta's girl cherry alone, why can't Emma take Petra's boy cherry?