Yumi was living happily with her remarried husband, and their sex life was fulfilling. However, Yumi felt unsatisfied with her husband's size. One day, her husband's son from his previous marriage came to stay for work, and the three of them started living together. Yumi doted on him like a son and welcomed him when she heard the doorbell. Seeing that he had grown a bit more mature, the couple was slightly pleased. At night, Yumi woke up to a suspicious noise coming from his room. She peeked in and saw him masturbating. Just as she thought about turning back, Yumi was shocked. His penis, ready to ejaculate, was bigger and more robust than anything she had ever seen. Yumi couldn't take her eyes off his actions for a while but suddenly came to her senses and quickly returned to her own room. The next morning, after sending him and her husband off to work, Yumi busied herself with housework. However, the sight of his act that she had accidentally seen wouldn't leave her mind, her body grew warm, and her fingertips began to stimulate her private area…
