Oh, wonderful! I've always adored Holmes, and to have a Conan Doyle-style Snarry is just a delight! I love the entire incident at Fortuity Falls, with Snape's "monstrous specimen of virility." Plenty of sparkling humor, and you've nailed both the characterizations and the style of the original.
But it's just begging for a sequel, you know. Holmes never gives up when the game is still afoot!