When Peter Green's girlfriend, Mckenzie Mace, straddles him on the couch, he thinks it's just another steamy afternoon. But little does he know, his stepsister Gracie Gates has been watching them from the doorway, her eyes widening at the sight of Mckenzie's bouncing breasts and Peter's thick cock. Unable to resist, Gracie joins in, taking Mckenzie's place and sucking Peter's cock while Mckenzie watches, jealous but aroused. The family taboo only fuels their passion, leading to a wild threesome that ends with Peter fucking both women senseless.