In order to fulfill the request of a client who wants to have sex with a close relative, Koichi Takahashi stands up... secretly filming the whole incest plan! Director Takahashi responds to a request from a brother who wants to have sex with his younger sister, whom he has been close to since childhood and has seen as a sexual object. The younger sister, who fell in love at first sight with her brother's friend, married him. Now, 14 years later, after having a child, she is troubled by her husband's infidelity and consults her brother. Director Takahashi is introduced by her brother as an expert in married women's troubles. The younger sister is given practical education on how to seduce him under the guise of teaching him how to conquer her husband. When she caresses the director and is stimulated sexually, her lust doesn't stop, and she herself desires a dick and cumming loudly. Later, she practices seducing her husband with another man. She has sex without knowing that the other person is her brother... even after the reveal, she cums wildly with her brother's dick.
