Mother Yumi is elegant and beautiful, someone her son Tomofumi has always admired. However, when Tomofumi discovers that she harbors unfulfilled sexual desires as a woman, he can no longer suppress his overwhelming urge to have her and finally attacks. At first, Yumi resists, but her reaction takes an unexpected turn. Contrary to her feelings, her pussy becomes soaking wet and eagerly accepts Tomofumi's cock. As relentless, pounding thrusts continue nonstop, Yumi's guilt gradually crumbles away, leading her into uncharted territory...