Sumire, a mother, was excited that her daughter and son-in-law were coming home for the first time in a long time. For her son-in-law's sake, Sumire decided to use the massage techniques she had developed for her job to help him recover from the fatigue of his long journey. While giving him a massage, Sumire felt that the bulge in his crotch was unusually large and could not take her eyes off it. Sumire woke up in the middle of the night and sensed someone's presence in the living room. Sumire sneaked closer and found her son-in-law masturbating. Sumire large penis made Sumire's vagina begin to throb and dampen. The next day, while she was giving him a proper massage, her husband and daughter went out. Her son-in-law was sleeping soundly.