This might be the most fabulous fic ever!!!
The Goodge Street Gambit and the Controversial Non-Holmesian Principle by
mariana_oconnor.
Summary: Lestrade and John play a game of Mornington Crescent, Sherlock tries to work out the rules.
Need I say more?
Summary: Lestrade and John play a game of Mornington Crescent, Sherlock tries to work out the rules.
Need I say more?

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That's a pretty good description! :) And poor Sherlock... *can't stop giggling*
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