Mother Ryo has been raising her only son Makoto single-handedly since she broke up with her husband. Ryo gives Makoto an education that can be said to be excessive, looking at her future, like her financially struggling ex-husband is a teacher. However, Makoto is also around the age, and gradually she is tormented by her sexual desire, and her awareness of her studies becomes scattered. Ryo thinks of her son's future and, knowing that it's her contraindication, lets her mouth satisfy her desires. However, her act ignites Ryo's hidden desires. Her sex education escalated, not only the structure of the female body, but also the feel of the female genitalia, and even the dense production act.
