My sister was supposed to be in the room alone and said she was going to practice recording. There was a time when she made a terrible sound, but gradually it became muffled and eventually she couldn't hear the sound of the recorder anymore. What the hell is this? I wondered if that was the end of the story, and when I looked into the room to see if she was actually having trouble concentrating, it was a surprise. The appearance of my sister masturbating furiously with a tape recorder