I have an idol I admire. She is said to be a once-in-a-thousand-years beauty with an angelic smile, the beautiful girl Yofu-chan. That Yofu-chan became my sister due to her parents' remarriage... My joy was short-lived, as she's always cold and distant at home. Though my admiration was shattered, I accidentally saw Yofu-chan masturbating, and from that day on, I've been used as a vibrator to satisfy my idol's sexual desires.
