Fucking my stepmom rough and making her take my cock in her old pussy

i know that my stepmom is very hot and very horny because my stepdad doesn't fuck her.so one day i see that my stepdad was out oh home and she was alone i start to talk with her about sex she replied me very openly that your stepdad doesn't satisfied me.then i offer if i will make you happy she said why not i will not share with your father you fuck me.