Kouhei, who was asked by his wife's friend Shiori to be a monitor for a men's esthetic salon, ended up having an orgasm during the treatment when his sensitive nipples were rubbed. Shiori, who became interested in Kouhei's sensitive nipples, asked him to be a monitor again and enjoyed watching him squirm while playing with his nipples. Kouhei's mind was filled with the pleasure of nipple teasing spun from Shiori's fingertips. One day, Shiori visited Kouhei's house...