A mother who made love to her son the night before is seduced by her daughter, who is also her brother's lover, when the daughter confronts her mother about the incestuous affairs.
Rick discovers that he is part of a breeding experiment designed to save the human race, starting with his Step-Mother and Sister. He uses his powerful pheromones and genetically enhanced cock to breed with any woman he pleases.
When fifteen-year-old Richard gets disturbed by his mom while he's masturbating he does his best to hide it. But then it becomes obvious that she's very, very interested in the lump in his bed covers. It turns out that he enjoys her attention just as much as she seems to like looking.