Mayura is a young lady who, since childhood, has visited her favorite riding club every weekend with her father. She always looked forward to riding her personal horse there. One day, she accidentally saw a horse's erect penis up close. The massive shaft was far thicker than her arm, and its vigorous movements seemed to strike against her belly with a sharp, pulsing rhythm. "S-Something incredible..." As a young girl at the time, Mayura couldn't help but be astonished by the sight. A man who had long watched over her in silence worked at the club as a stablehand. He was deeply in love with Mayura, but their difference in social status kept him from ever confessing. Recalling those days, he would often find himself masturbating with his right hand. As the years passed, Mayura's body matured into an increasingly sensual form. Her white riding pants were always see-through, and the way she sat on the horse exuded a temptation that strongly evoked the image of the cowgirl position.