In order to fulfill the request of a client who wants to have sex with a close relative, Takeshi Karagi stands up... Filming the whole plan of incest! A request from a son who was shocked to learn about the perverted acts of his parents, who are over fifty years old. In accordance with the son's wishes to hold his mother, whom he had been aware of as a woman, bypassing his parents who were looking for a cuckolding partner, he contacts the mother. Pretending to be the son's boss, he explains that he knows the parents' secret and introduces a man suitable for cuckolding... Later, at a hotel, Director Karagi and the mother have a cuckolding sex session. While blindfolded and masturbating with a toy, the son invades. Without knowing it, she sucks and is inserted with her son's dick. The mother panics when she finds out while feeling great. After being explained and knowing her son's love, the parent-child sex is resumed. Later, she is also thrust with the director's dick and reaches climax.