One day, her daughter Ami says that her boyfriend is coming over, and her mother, Mizuki, is in high spirits. However, the boyfriend turns out to be Mizuki's sex friend, Kiyoharu. Although she is confused, Mizuki is excited by the situation of her daughter's boyfriend and approaches him with a seductive smile, saying, "How greedy to be with not only me but also my daughter, aren't you?" She enjoys their secret relationship while playing with his cock. However, Mizuki aroused body can't endure the one-time sex, and she sneaks into Kiyoharu's bedroom, where he is staying the night...