Story quote: "You don't read Ancient, do you? I know, stupid question, but maybe the console will give you something in the--" McKay looked up, and suddenly went from cooing dove to, well, not. His mouth jerked down in mid-grin, one side faster than the other, into that flabbergasted scowl that suggested he'd have to kick himself later for forgetting just how truly stupid other people could be. "No! What are you doing? Don't touch! Did I say to--"I just can't express how much I love this--how perfect and observant a description it is, especially: His mouth jerked down in mid-grin, one side faster than the other, into that flabbergasted scowl that suggested he'd have to kick himself later for forgetting just how truly stupid other people could be.
And there are jillions of other McKay-spotting moments in the story. I mean, looking at it from just one valid reader-response interpretation, the whole story is one long, delirious, erotic meditation on Rodney's neck, and in no way is that a bad thing. Because, neck. Even just thinking about it makes me go dry-mouthed and twitch a little. So I'll probably go do that in private now.
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(Thank you to astolat for posting a rec for this! :)