Stepsister cums hard on my big toy

My stepsister is a big fake tits stripper slut. That is for sure. I talk her into playing a game with me or I will tell everyone which club she is working at and being a slut at. She agrees with this and then I go to work by cuffing her to the bed and making her cum while her huge tits bounce all over the place. Would you jerk off on those tits? I should shouldn't I?