The Busty Lesbian(1990)

A unique erotic drama depicting the hellish lust and love-hate of a father-in-law and daughter-in-law. While Natsuko is in a relationship with her colleague Ryoichi, she also allows herself to be with her father-in-law, Kyosuke. One day, when she meets a young girl named Akiko, she is attracted to her body and has a physical relationship with her.