The stepmother's alluring breasts were even more apparent when she was drenched in sweat. (Aoyama Nana, OKSN-200)

Although remarried, Nana is sexually frustrated due to disharmony in her sex life. While her relationship with her stepson, Masato, is lukewarm, their increased conversations eventually lead her to waver after finding semen on his underwear. She helps the sexually inexperienced Masato masturbate and perform oral sex on him, and gradually, Masato becomes attracted to Nana's large breasts, developing a relationship that transcends familial affection… The forbidden sex makes Nana's burning desire uncontrollable…