Yumiko, whose husband had passed away before her, decided to live with her daughter and son-in-law. The couple welcomed Yumiko, and the three-person family life began. One night, unable to sleep, Yumiko noticed sounds leaking from her daughter's bedroom. She peeked in secretly and saw the couple in the act. Thinking 'they get along well,' she returned to her room. A few days later, as the couple started their usual act, Yumiko sneaked a peek again and masturbated while watching them. The next day, hearing that her daughter was going on a trip, Yumiko inwardly smirked but maintained her composure. On the day of her daughter's departure, she observed her son-in-law and found him pleasuring himself. Yumiko pretended to enter his room by chance, told the embarrassed son-in-law 'it's okay,' and gently smiled, asking 'shall I help you'...
