Reiko, who lives with her daughter and son-in-law, was feeling restless. This is because she had heard the sounds of their activities. While it's a good thing that her daughter and son-in-law get along well, for Reiko, who sleeps alone, it was poisonous. One night, Reiko woke up and witnessed her daughter and son-in-law's act, and unable to hold back, she comforted herself. Despite falling into self-loathing, she continued her daily life. However, one day, Reiko saw her son-in-law masturbating in the living room and ended up seducing him, leading to a relationship. But when her daughter suspected her husband of infidelity, Reiko's relationship with her son-in-law also ended. However, once ignited, Reiko's body could not be satisfied with self-pleasure alone, and she ended up having intense intercourse with her son-in-law...
