My sister was supposed to be alone in her room saying that she was going to practice recording... At one point she made a terrible sound, but... gradually it became distorted 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 really having trouble concentrating, what a surprise! The appearance of my sister masturbating intensely with the recorder...