Shion Yumi is married to her husband and lives a happy life. One day, her husband met two fat old friends and now they work as cargo truck drivers. The next day they had a drinking party at Shion's house. The two fat men looked lewd and immediately noticed their friend's wife Shion because her breasts were so big and her pretty face made her want to fuck her. Luring her friend to get drunk, the two of them played debauchery with her friend's wife. However, this did not make her panic. Shion had been lacking sex for a long time and this was an opportunity for her.