There was nothing that Sherlock loved more than to see John oh so slowly come apart under him.

His tongue moved down, down down, over his perineum, and to the tight puckered flesh between his cheeks. His eyes canted up at John- this was something that they had never done, this relationship was still so very new to both of them. He wanted to make sure that this was something that John wanted. If not, there was plenty more of him to tease and explore.