My wie told me one time of a fantasy she had where I come home from work and catch her fucking another man.  She tells me that I stand in the doorway and stroke my cock while she fucks him until he fills her pussy with his cum.  
  
Then, I fuck her until I cum and eat it all out.  God, it would turn me on to have her actually do this.  
  
Has anyone ever caught their wife doing something like this???