Watson overreacts to homophobic remark

[le-froufrou.livejournal.com]

I'm looking for this established Holmes/Watson fic, victorian!verse. At the beginning, Watson is playing cards with some Yarders in a pub, and someone makes an off-hand homophobic remark. Watson, taking it too seriously because he is deeply afraid that anyone might find out about him and Holmes, reacts far too strongly. Everyone looks at him, taken aback, with the result that Watson gets more and more flustered and eventually storms out. Someone (Lestrade?) goes after him to see if he's alright and again, Watson's reaction is too extreme. Watson goes home and confesses to Holmes that he made a blunder, but I have no idea how it develops from there. I think someone does try to blackmail them?

Any pointers would be greatly appreciated!

*FOUND: A Case Of Identity by sparkle_free, wherein Holmes goes "undercover" as Mary.