Miki, a mother-in-law living alone after her father-in-law passed away. The daughter and her husband decided to live together out of concern for Miki's lack of energy. Living together was going well, but the son-in-law was in agony every day. His mother-in-law's body was so attractive that he couldn't help but fantasize about having sex with her. One day, the son-in-law returned home early. His wife went out shopping. As his mother-in-law was about to prepare for the bath, the son-in-law hugged her and caressed her, saying that she was too attractive. Miki was reluctant, but she was originally a pervert. Even though she said no, her vagina immediately responded and her love juices flowed. "I can't believe... my daughter's husband has such a strong penis... I'm in trouble..." Miki was made to climax many times by her son-in-law's penis without even realizing it. Days like this continued... One day, her daughter finally witnessed her affair with her son-in-law...