Maki, who lives with her daughter and her husband, originally knew only ordinary SEX with a serious personality. However, one day, she finds out that her daughter and her son-in-law, Tetsuya, who has no sex with her, have been secretly calling a delivery health service to torture her nipples... Seeing that, she couldn't control the pain that welled up from the depths of her body, and she blamed his nipples, saying, "To mediate the couple's relationship." Tetsuya reacts in an amusing way, and Maki can't contain her excitement, so she steals her daughter's attention and teases his nipples, regardless of where he is...