Yumi, the mother, is incredibly beautiful and pure, a source of pride for her son Toshifumi. When Toshifumi learns that Yumi has sexual frustrations as a woman, he can't hold back his urge to 'fuck' and attacks her. Although Yumi resists, her body betrays her feelings and eagerly accepts his cock. The endless, rampaging pistoning shatters any sense of guilt, driving them into unknown territory...
