Kyouko lives a normal, but relatively happy life, until one day she ends up helping her son masturbate. They'd agreed it would only be a one-time thing, but her son's demands steadily escalate, and Kyouko and her son finally engage in forbidden mother-son incest... The son is obsessed with the charms of sex, and the mother is reminded of the pleasures she had forgotten after more than a decade of sexlessness. Before long, the two are intoxicated by forbidden carnal desires...