Manabu, who lives in a single-parent household, secretly adores his friend's mother, Yuka. And before he knows it, that feeling turns into love... At that time, Manabu accidentally witnesses a lewd act that awakens him sexually, but he doesn't know how to release it and spends his time in agony. Yuka, who knows his troubles, secretly teaches him how... Then, unable to control his reason due to the stimulation he feels for the first time, Manabu attacks her in frustration. Yuka, who keeps coming from his beast-like, violently pulsating penis, can't hold back...