"I want your wife to pretend to be her lover..." The worst outcome of me, when my best friend begged me to lend her beloved wife...

"We'll only meet up, and we'll cooperate. It'll be for you too..." My unrestrained friend Yuta asks me to lend him my wife, Natsuo, because he wants to cover up his mother as she is pushing for an arranged marriage. He is also guilty of being cared for at work, so he cannot strongly deny it and ends up accompanying Yuta to Yuta's parents' house. I thought I would return that same day, but my wife contacted me to stay at home for three or four days during the holidays at the strong request of Yuta's mother. Furthermore, it seems that they have been sleeping in the same room...