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Sumire's sexual desire was so strong that her boyfriend asked her to break up with him. One day, when I was looking for something in my younger brother Katsuhiko's room, I found an unused shoulder ticket that I had made a long time ago. When my parents were out on a trip and I was masturbating as much as I wanted, I discovered Katsuhiko who was masturbating outside the room. Sumire remembers the shoulder slapping ticket and presents it to her as a ``vagina slapping ticket'' that will help her use up all the condoms this time. While their parents were away, the siblings were able to unleash their sexual desires on each other.