After losing her husband and with her daughter married off, Yumi had been living alone. Two months ago, she fell ill and was cared for by her daughter and son-in-law. Worried about her well-being, they decided she should move in with them, and now they live together. One day, after stepping out of the bath, Yumi realized her underwear was missing and called out to her daughter to bring her a fresh pair. Instead, her son-in-law appeared—and saw her naked. Ever since, recalling that embarrassing moment has triggered intense arousal, leading her to indulge in masturbation repeatedly. Craving even greater excitement, she began going braless and pantyless, thrilling in the risk. But one day, her son-in-law caught sight of her like this—and a new chapter began.