Sherlock got on his hands and knees on the floor, looking back over his shoulder at what John was doing. His cock hung, hot and heavy down between his legs, the slightest bit of moisture on the tip.

"Ahhhhh!" His eyes went wide. He had never been licked before. It was an.. intense feeling, there are a lot of nerve endings there, and even a light touch sent a spike of heat through him. Instinctually, he spread his legs out wider to give John an even better view, and access to his plump cheeks.