NEWM-002 - My dad's is too soft... My son caught me masturbating and took over

Sayako lives with her husband and son. While she and her husband still have a good relationship, his performance in bed has been lacking lately, leaving her unsatisfied. She's been resorting to masturbation to cope. One day, her son catches her in the act and confronts her, saying, 'Dad's soft one isn't enough for you, right? Let me give you what you really need.' From that day on, she begins a secret, illicit affair with her son right under her husband's nose.