Yui was left alone with her father-in-law after her mother went home. When he entered the bathroom, he directed the showerhead at her private parts, making her experience sensations she had never felt before and guiding her to her first masturbation. Even after leaving the bathroom, Yui couldn't resist what her father-in-law said. Although she was aware that she was doing something wrong, she became a victim of her perverted father-in-law's sexual desires...
