Sherlock felt the smile creep along his lips before he could stop it, before he could look back to the case and fall back into the mystery yet to solve.
"Do people usually assume that you're the murderer?" John had said. It hadn't been any uncomfortable pauses, it hadn't been immediate leaving, it hadn't been screaming or panicked breathing or dialing 999 as he scrambled away.
It had been calm, cool, collected, and just a bit... dry. Like he honestly hadn't expected or hadn't cared if Sherlock was the murderer. No panic. No fear. No horror.
Oh, John Watson was a terribly interesting man.
"Now and then, yes."
And it had been back to the case, just like that, although Sherlock was generally more amused than he had been earlier.
Good, ol' loyal doctor.