Sorry if this has been done but I saw a movie where a stupid blonde was woken up and made to suck dick. She was one of the worst actresses I've ever seen...
Anyway, I had this idea. You take a group of whores and put them in a cheap hotel. The keys are given to the film crew who can come in at any time in the night and begin to fuck them before they wake up. Get their real reactions when they awaken to a cock shoving up their ass!