Kosuke, a friend of her son's who got a job earlier than her, came to stay for the first time in a long time. Unlike her son, who is a student, Ayaka him because he behaves like an adult. She is interested in him, who is busy with work and has no time for women, and tries to have a quick meal with him... However, she is driven crazy by his insatiable sexual desire, which doesn't fade no matter how many times he cums! After that, Kosuke's endless desire for Ayaka continues to drive her body to its limits...