CHRV-117 The stepmother wants to return to her youth.

My sister was supposed to be in the room by herself saying that she would practice recording... At one point, she made a terrible sound, but... gradually it became distorted and eventually she could no longer hear the sound of the recorder... 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, it was a surprise! My sister was vigorously masturbating with the recorder...