The husband goes to a hot spring inn with his wife and a mommy friend, and ends up accidentally bathing with the mommy friend. However, when he finds out that the mommy friend doesn't notice his husband, he secretly masturbates while looking at her naked body. However, when he is found out and apologizes, the husband is happy to be seen as a woman and wants to see him masturbate. Eventually, the mommy friend can no longer contain her excitement and reaches for his dick...