Ah, so very, very satisfying. Acute characterisation, slow-building tension, great deductions and some lovely phrasing (too much to fit in one comment, so just a few stand-outs for me):
Holmes tapped a long, pale forefinger against his lips. “If you would be so kind as to bring it to me, I will tell you why it makes you smile,” he said
I have dreamt of his hands living a life of their own. They are the graceful and expressive hands of a hedonist that he has impressed into the service of science. They subvert his intent and curve around his test-tubes with a delicacy of which the most renowned ballet dancer would be jealous. I watched them stroke down the silken front of his dressing gown to disappear into his pockets on some mundane search and wondered what sensations were transmitted from his fingertips to that great mind of his. Hnggg. Down, Watson.
dangerous pleasures. I read it twice before I closed the book I’ll bet he did.
Men look well in evening clothes. They are something of a uniform and have much the same flattering effect upon the male form So very much agreed.
His expression revealed only a modicum of interest in the crowd, possibly a faint hope that one of them would commit a crime during the evening *snort*
I had been places where it was not a crime. So had Holmes Yes, indeed. Places on earth and in the mind, too.

All that and a rich use of the symbolic language and natural beauty of flowers, too. You have deduced me so well. Thank you so much, dear anon!