Mom with elastic tits after blowjob substitutes pussy for flogging in the first person

Probably many are shocked, but for three years now I have been living with my stepmother sexually and both of us are more than happy with it. But today, returning from college, I learn that my stepmothers half-sister has come to visit us and she will live with us for a while. I’m not even going to give up sex for the sake of this, and the stepmother has to be specifically encrypted in order to give me pleasure and at the same time to enjoy herself almost in the presence of my sister.