Ataru, a son, is asked by his mother to greet a friend who is coming to stay at their house. He wonders what kind of woman will come since she is his mother's friend, but when he arrives at the meeting place, he finds out that she is a beautiful mature woman named Hisae, who bears no resemblance to his mother. He becomes nervous at her beauty and runs away to his room. Unable to suppress his rising sexual desire, he starts masturbating while using Hisae as a masturbation aid, but Hisae sees him. However, Hisae is aroused by the cock she hasn't seen in a while and is frustrated, so he can't hold back and begs her to show him more...