Maeda Kanako discovers her son masturbating while wearing her underwear. In that moment, she feels something must change, and decides to give her innocent son a sex education of her own. But this lesson quickly escalates beyond expectations, and soon Kanako ends up deflowering her son herself, using her own pussy. Overwhelmed by her son's youthful, vigorous cock, Kanako becomes instantly addicted, gradually craving him more and more, sinking deeply into hardcore incestuous creampie sex. The story follows the evolution of their forbidden relationship, Kanako's shifting emotions, and the inevitable consequences that lie ahead.