Yumi divorced, remarried, and was living happily with her husband. Their life together was fulfilling, and their relationship was strong. However, Yumi felt unsatisfied with her husband's physical size. One day, her husband's son from a previous marriage moved in temporarily due to work, and the three began living together. Yumi genuinely welcomed him, treating him like her own son. When the doorbell rang, she happily greeted him and led him inside. Seeing how mature he had become, both she and her husband felt pleased. That night, Yumi woke up to strange noises. Following the sound, she found herself outside her stepson's room. Peeking in secretly, she saw him engaging in adult behavior, his grown-up body clearly on display. Surprised yet intrigued, Yumi found herself captivated by his large frame, mesmerized by the sight for several moments before snapping back to reality and rushing back to her room. The next morning, after sending her husband and stepson off to work, Yumi went about her housework. But the image of what she had seen haunted her, stirring deep emotions and slowly heating her body. Instinctively, her fingers began touching her most sensitive area, his presence now deeply embedded in both her mind and body.