Yumi, an education-oriented mom who is enthusiastic about enrolling her son, Hiroshi, in the same prestigious school as her husband, is flawless except for her heightened sensitivity and uncontrollable arousal once a month during her dangerous days. Unaware of this, Hiroshi, seeking to vent his pent-up frustrations, pretends it's a coincidence and exposes his masturbation on a dangerous day. While her husband is away on a business trip and she hasn't had sex for a long time, Yumi, regardless of whether it's her son, eagerly sucks on the erect penis and shakes her hips lewdly, following her instincts.
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