Cock Crocodile

When a girl, who doesn't know how to give head. Decides to try it, but viciously scraps every tooth in her mouth up and down. While thinking she's pleasing you, as she mistakes your squirming and twitching in pain as pleasure. And refuses to stop.

Hey Jimmy did you finally , get Sally to give you head?
Ya but it wasn't that great, she's a real cock crocodile.