すみれは彼氏から別れを切り出されてしまうほど性欲が強かった。ある日弟のかつひこの部屋で探し物をしていると、昔作ってあげた使われていない肩たたき券を見つけた。両親が旅行で外出中、好き放題にオナニーしていると部屋の外には自分のオナニーでシコっているかつひこを発見。すみれは肩たたき券のことを思い出し、今度はコンドームを使い切ってくれそうな「膣たたき券」としてプレゼント。両親不在の間、姉弟は思いのまま性欲をぶつけ合うのであった。
Sumire’s sexual desire was so strong that her boyfriend asked her to break up with him. One day, when she was looking for something in her younger brother Katsuhiko’s room, she found an unused shoulder ticket she had made for him a long time ago. While her parents were out on a trip, they found Katsuhiko masturbating outside her room, masturbating as much as she wanted. Sumire remembers her shoulder slapping ticket, and she presents it to her as a “vagina slapping ticket,” which she hopes will help her use up all the condoms this time. While her parents were away, her siblings were able to share their sexual desires with each other.

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