A mother finds out that her son has been watching her masturbate. The one word she says to him as a temporary solution, "Mom, can I help you?", turns her son into a sex monster. Even though he is her son, her body reacts when her ample breasts are sucked and her fingers are thrust into her pussy, and she involuntarily raises her hips and wets her crotch. After a long time, she takes a cock other than her husband's into her vagina and uses her hands and mouth to make him ejaculate. After that, the son, unable to forget the taste of his mother's body, has sex with his mother again, on the pretext that he won't tell his father. His mother climaxes many times due to his son's intense, animal-like hip movements, and the one-time promise makes her want her son.