Free Use Cumslut Mommy

I find out my step-son is having an affair with my best friend, I confront him and ask him to stop, he gets his cock out and says he will stop if I become his cumslut mommy. I am surprised by how amazing his cock is but I resist. I call my friend to ask about my step-son, masturbating as she tells me about his cock. I decide to tell him he can fuck me this once, he gives me a facial and creampies me, he then makes me agree to being his cumslut mommy forever, before fucking my ass.