He could feel John's movements through his finger when he anxiously wiggled below him, every movement shifted the angle inside of him just a little bit.

"Calm down, anxious little thing." Sherlock smirked. He pulled back until only the tip of his finger remained, then pushed back in, hooking a bit to try to find the prostate. He was usually pretty good about it, but it was easier to find on some than others. That was one thing he always enjoyed, figuring out how each individual he had sex with worked, what turned them on and what didn't. The exploration and discovery was almost as good as the actual sex.

Almost.