My mother's friend Mari came to Tokyo to accompany her husband on his work. - When his son Kazuya learned that the woman of his dreams was coming to stay with him for a few days, he couldn't hold back his excitement. - On the other hand, ever since she witnessed him masturbating, Mari has secretly felt a sense of awkwardness... - She was moved by the sight of him growing into a strong young man, and couldn't help but kiss her lips, using his drunkenness as an excuse. - Her body, which had forgotten about men for years, feels passionate excitement at the touch for the first time in a while, and even though she knows it's a friend's son, she crosses the line...