Musuko no Tomodachi ni Okasarete

Yoko is happy.

She lives a peaceful life with her husband, Masahiko, and their son, Kazushi.

But there is one thing she complains... They haven't had sex for a long time.

One day, a friend of Kazushi comes to her house.

His name is Ryouto.

He is handsome and polite.

But she doesn't know yet that Ryouto has a secret personality...