The voucher for vaginal massage, obtained from the slender, busty, sex-crazed older sister, allows for penetration anywhere. (Kurokawa Sumire, DASS-302)

Sumire was dumped by her boyfriend because of her excessive sex drive. One day, while looking for something in her younger brother Katsujiro's room, she found an unused shoulder massage coupon she had given him before. Since their parents were away on a trip, Sumire was free to indulge her sexual desires, but outside the room, she found Katsujiro masturbating. Sumire remembered the shoulder massage coupon, so she decided to give it to him as a "vaginal massage coupon" as a gift, so that the siblings could indulge their sexual desires when their parents were not around.