10歳年上の奥さんを騙して友達に会いに行かせ、その場で誘惑してしまったら

I think we are a very good couple. However, we have recently become sexless. In an evil plot, I trick my beloved wife into asking her to take care of a friend and see if she get fucked! A wife who is used to being a carer gradually allows herself to be seduced by my friend...