Eriko is happy that her beloved Akihiko has brought his friends over for the summer holidays. The naughty boys say they want to stay the night to see her big tits, so they take a bath together and rub her breasts. Her ripe body, which is not satisfied by her erectile dysfunction husband, accepts her dick and climaxes. The naughty boys escalate and tie up Akihiko and his father, and show them how they have sex with their mother! The useless husband gets excited seeing it and has sex with his mother for the first time in years, and it's the forbidden first time for his son. Ko○ also injects a large amount of semen into the vagina of his mother, who has turned into a horny bitch!