After witnessing his stepmother Sasa pleasuring herself in the bathtub, Shinya could no longer be satisfied with just watching. His mind fell into turmoil—lonely, driven by desire, torn between longing and guilt over crossing the line with his own stepmother. Meanwhile, unaware of Shinya's inner conflict, Sasa came to the bathroom to ask him to clean it. The bathroom, once merely a place of stolen glances, had now become the center of his lust. With Sasa standing right before him, Shinya could no longer restrain himself and gave in to his emotions. In that moment, he lost all control.