A few years after getting married. I never thought that not having sex would be so painful for me when I was still young. At that time, my mother came to Tokyo on a trip. It had been a while since I had seen my mother, and she looked healthy, so my wife and I welcomed her with joy. My wife invited my mother to take a bath to help her recover from the fatigue of the long journey. At that time, I accidentally saw my mother naked. Although some parts of her body were broken compared to the ones I saw as a child, she was very voluptuous and I was aroused by her body. That night, I hugged my wife, asking her to calm my hot crotch, but as expected, she refused, so I made a decision. The next day, when my wife went out shopping, I asked my mother to listen to my troubles. I couldn't get my wife to do it, so I hugged her, asking her to do something about my hard crotch. My mother said no, but she gently hugged me, buried her face in my crotch, and led me to ejaculation. However, my erection did not go away even after I ejaculated, so I decided to have sex with my mother.