Pick out a particular guy. It can be someone you both know or just somebody you have seen at the store, school, work etc. Throw him in the fantasy and something about that makes it more personal and much hotter.
If she really gets into it tell her to show you haw she wants to fuck "John" or whoever he may be.
Tell her to pretend she's fucking him, tell her to show you how she wants to kiss him and get his cock hard so he can cum in her.
The only thing is, it will get old after a while and you'll have to change the dude to someone else.
Also if you ever get the chance to see her shake a large black mans hand you're mind will go straight into the fantasy when you see her pretty white hand in his black hand.
My wife is built for black men and gets tons of attention from them, which I love.
Check out her picture and let me know what you guys out there think.
If anyone else out there is into doing this stuff tell us your story.