Chigusa, who moved in with her married daughter and son-in-law six months ago, accidentally witnessed their intimate moment. Since her husband's passing, she had been starved of intimacy and ended up masturbating out of excitement. From that day on, Chigusa started sneaking peeks at their sex sessions, even masturbating in the kitchen or bathroom. One day, while her son-in-law was in the kitchen, Chigusa arrived. Her towel slipped off, exposing her completely naked. Her son-in-law, aroused by the sight, pounced on her. "I could hear you masturbating in the bathroom," he whispered.