An returns home for her impending wedding and reunites with her former lesbian lover, Mei, a junior from her student days. Though Mei is already married, An's heart flutters at their long-awaited meeting. Unknowingly, or perhaps intentionally, Mei seduces An. Exhausted from obligatory sex with her husband for fertility purposes, An surrenders to the pleasure unique to women, a pleasure she hasn't experienced with men. Despite feeling guilty, she yearns for another encounter. They heighten their pleasure with intense kissing, drooling saliva, and skillful cunnilingus and toy play, leading An to multiple orgasms. Mei proposes they co-parent a child using their breast milk if she gets pregnant. An becomes sensually absorbed in this abnormal play, involving diaper-clad An being treated like a baby, all under the guise of a "fertility lesson."
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