"Sex isn't just about intensity." Ryoko Murakami, a gentle mother teaching her son how to thrust. (OKSN-210)

Ryoko, a mother worried about her introverted only son, one day discovers sticky stains on his underwear and finds her own underwear in his room. Realizing her son is troubled by sex, Ryoko begins to use her own body to teach him sex education. However, the son, captivated by his mature and beautiful mother's body, attacks her as she secretly masturbates, forcefully inserting his penis. Ryoko is happy about her son's growth and accepts it.