I think its very posible that the mom wont fuck Vargas o anyone else, azienda already stated multiple times that the focus is on Vargas, Aiden and Luna, she will probably play some major role regarding the endings, that is my bet.
But with that Nevin scene he could have changed plans, I'm not entirely sure the nurse flashback scenes were in his plans from the beginning, if no one complained would he had added them? If he listened to the fans about the hidden scenes maybe he will also listen to the demands about more character diversity on the h scenes, i believe he should stick to his original script in the case he is considering changing the story to apease fans but i also believe he should not have lied about the 2 povs, but again if this was the plan all along and no changes were made based on critisism then he told no lie, that ending on episode 6 would just make him a big tease not a liar.
I think there is no middle point, the mom is either going to end up a super slut or not at all.