Masaki has decided to stay at her aunt Reiko's house because of her work. There was no inconvenience, but there was only one problem. It was Reiko's overflowing libido. Masaki spends a sleepless night every day in the nasty voice of Reiko who is absorbed in masturbation at night. One day, while being puzzled by her who wants to enjoy the limited number of women, Reiko suddenly came in while Masaki was taking a bath. It was a child who played with a meat stick that erected prominently with Masaki who was upset.
