Once, I was kneeling at the end of the bed, and he was standing over me, fucking my face.  His hand cupped my chin as I throated his cock, but I wanted more. I pulled back, gasping, and rested my face in his hand, before I turned my head and bit his hand, hard.

He jumped back, but I held on harder, before going back to his cock. After a few moments, I stopped again, and again, I bit his hand.

This went on for what felt like another ten minutes before I finally pulled back and said

“Jesus Christ, what do I have to do to get you to slap me?!”

“Oh!” Jefferson smile “That’s why you were doing that”

And then he hit me, and all was well. :)