Yuki, a devoted housewife with a happy family, harbors a secret concern. Worried that her teenage son shows no interest in sex, she feels both a mother's responsibility and a woman's affection, deciding to provide him with proper sex education. Yuki begins teaching her son how to ejaculate through handjob and blowjob lessons. Going further, she uses her own body to carefully instruct him in the ways of sex, imparting correct knowledge and firsthand experience as she fulfills her duties as a parent. In her actions, love and discipline intertwine, revealing Yuki's deep hopes for her son's future.