Rosalyn Sphinx has the best step-mom ever. After school one day, her step-mom informs her that shes been helping her step-brother with a particular problem, but she needs some help. Turns out, their step-mom has been helping him jerk off. She enlists Rosalyns help in tutoring her step-brother and introducing him to all the pleasures of pussy. They open his bedroom and barge in on him jerking off. Rosalyn wastes no time taking his dick in her mouth and sucking him off while step-mom watches approvingly. The next day, Rosalyn is talking to her step-mom over lunch when her stepbro wanders into the kitchen. His eyes fix on his step-sisters ass, peeking out from under the pale pink slip shes wearing. Like a magnet, his stiff cock pulls him closer to her ass. Shes happy to see him and even happier when he lifts her slip, exposes her ass and slides her panties down around her ankles. He fucks her from behind, all the while their step-mom sitting there watching them fuck. They make their way to the sofa and step-mom helpfully suggests that he busts his nut all over her step-daughters face.