Mariko, who is frustrated due to lack of sex with her husband, secretly consoles herself during her troubled days.One day, she finds out that her son-in-law, Shinji, who lives with her, secretly masturbates for the same reason...Mariko was captivated by the non-standard big dick that she happened to see, and she told herself that it was for her daughter to let her vent, and she secretly took advantage of him day and night. He continued to tempt her.And Shinji can't resist the lustrous charm that exudes from her stepmother, and continues to be played with his cock over and over again...