Who was masturbating? Alma or the new girl?
We also need some kind of name for her other than "the new girl."
Also, I never really entertain these ideas of threesomes or couple swaps other people have here because they're never going to happen, BUT for the sake conversation, I think if (and I'm talking a HUGE if) something like that were to come up, from what I can see based only off of body language, Stefan would be 100% against the idea, Alma would have no desire for it but can MAYBE be talked into it, the new girl seems like the most willing to participate or may actually want it to happen, and her boyfriend would probably just go along with whatever happens because he doesn't give a shit one way or another.