Your step mom comes to you because she's worried you never have any girls over. You know your stepdad has put her up to this.She asks you all sorts of questions about your sex life and you tell her the truth, you don't stroke your cock, you have never been with a woman, you don't know what to do because you are 24. She takes it upon herself to show you her pussy and her ass, she fingers herself and lets you taste it. She is trying to show you how to be with a woman. You can't ask for a better teacher, who cares if its your step mom.