Marina has been living with her daughter and son-in-law for a year. Their relationship is good and their daily life is peaceful, but there is one thing that worries her. Her husband has erectile dysfunction and they haven't had sex in the sex life for a while. Recently, she has been exercising to ease her physical loneliness, but when she finds out that her son-in-law Yasuo has a big dick, the desire that lies dormant deep inside her body begins to smolder... Marina shows off her voluptuous body and seduces him, day and night. Yasuo's big dick, which has been building up due to a lack of sex, can't resist her temptations...