[John stops his ministrations with a twitch. A very blatant twitch. It's a gesture of surprise, yes, but not one of disgust. Quite the opposite, really, and his brain needs a second to regroup from Sherlock's statement. How is it possible for somebody with such little physical experience be such a naturally talented tease?]
How... how on earth do you know about that trick? How much reading up have you done since we first kissed?
[Action]
How... how on earth do you know about that trick? How much reading up have you done since we first kissed?