Shiho married Shinsuke, her stepson, becoming his stepmother. However, due to Shinsuke's young age, an invisible barrier always existed between them. Shiho constantly struggled with how to overcome this divide. One morning, as usual, she entered Shinsuke's room to wake him up. But when she pulled back the futon, she caught sight of his morning erection—an intimate part of him she had never consciously noticed before—and it instantly captivated her gaze. Aroused beyond control, lewd words involuntarily escaped her lips. In that moment, a powerful shock surged through her, as if the wall between them had suddenly crumbled away.