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John must have made some answer. Certainly, his lips were moving and Sherlock was vaguely aware of sounds reaching his ears. His brain, however, thoroughly refused to cooperate, to focus on anything other than the sight laid out before him. John, his coat collar turned up against the rain, taking a long pull on the cigarette that had so recently been in Sherlock's mouth. The way his lips curled tightly around the cigarette, his cheeks hollowed ever so slightly, his eyes half-closed in an expression reminiscent of, well, other pleasures.
This was potentially problematic.
(A gapfiller both for His Last Vow and the pool scene in The Great Game/A Scandal in Belgravia.)