Another difference: Sherlock isn't thinking of Obadiah's self-control, isn't thinking of how much he wants to know firsthand what is under all those carefully guarded habits. He still does, yes, but it isn't the time.

He is thinking mainly of where the faint fingerprints are going to show, and the way Obadiah's weight presses his collection of incipient bruises against the bed, and how incomparably lovely this feels. And the numbers. His pulse is usually faster than this at this stage, even with Tony. He wonders idly what the difference is, but doesn't pursue the thought all the way to its conclusion.