Mio lost her much older husband to illness and has been living alone with his son, Kenichi. As a woman in her thirties, she had remained faithful and chaste since her husband's passing. However, raising her stepson day after day awakened a deep longing for physical intimacy she could no longer suppress. One day, seeing her stepson's strong morning erection, she could no longer resist and took his hard cock into her mouth. In that moment, she made the decision to let go of her former self.