CHRV-117 Stepmother wants to return to her youth

My sister was supposed to be in the room alone saying she was going to practice recording... There was a time when she made a terrible sound, but... gradually it got muffled and in the end she couldn't. heard the sound of the tape recorder too...what the heck is this? I wondered if that was the end of the story, and as I looked into the room to see if she was really having trouble concentrating no, what a surprise! The appearance of my sister masturbating furiously with a tape recorder...