18-year-old female student Seiko, despite her cute appearance, turned out to be highly sensitive and extremely horny. When I approached her, surprisingly, she came along willingly. She's shy by nature, and her reactions are incredibly erotic. At orgasm, she screams uncontrollably—so loudly that neighbors almost yelled at us due to the thin walls. I made her climax repeatedly, and my sadistic side was thoroughly aroused. My first encounter with such a natural-born masochist girl—truly an intense and thrilling experience.