Mitsuo and Suzuka have been married for 23 years and are still good friends. Even though my son Yuji has grown up, we still take a bath together every day. Then, in the bath, Mitsuo, who has a strong sexual desire, sucks Suzuka's nipples while dithering, and her mother becomes just a female in the bath, forgetting to keep her voice down and sucking on Mitsuo's cock. Unaware that their parents are kissing each other and mating in the small bathroom, Yuji presents them with ``comfortable bath goods'' for their wedding anniversary...