"Nnnnnnggg..." Sherlock leaned down and whispered in John's ear, in a low, almost dangerous sounding tone. "I intend to find out."

Without any warning, he pulled away from John, and rolled the man over onto his stomach. His hands went to John's arse, pulling the cheeks apart. "I'm not even going to bother stretching you. By the time the night is over, you'll be so open from my cock that I'll be able to push inside with no resistance at all. "

He leaned his head down and licked a stripe up John's fissure, from perineum, over the puckered hole, then up to where his arse met his back.

"On your hands and knees. I want to fuck you properly."