Once your stepsis realizes you were in her class when you were still in school, she begs you for help, and to give her all your old work. Finally, you have a way to bring up your longtime fetish of fucking your sister, and maybe can even pressure her into it. Who cares, she was kind of a spoiled brat anyways, and now you have a chance to repay her. You're gunna fuck her right here, right now, while moms in the kitchen making dinner. (Dildo riding, sucking, dirty talk, orgasm)