My mother's friend

One day, my mother's friend Sayuri came to the house to attend her son's graduation ceremony. His son Shinji is so beautiful that he can't believe he's the same age as his mother, and he is nervous and unable to match his face well... Sayuri, feeling lovey-dovey at this innocent look, suddenly kisses her. Shinji, who has never dated a man of the opposite sex, runs away to the bath in an attempt to maintain his rationality. However, once she's hot, Sayuri can't contain her body, so she sneaks into the changing room...