I love what you did with this! I'm especially partial to well-written AU fics and this one was simply brilliant. I loved the repeated references to Sherlock Holmes and your re-interpretation of The Devil's Foot (one of my personal favorites). The cameo appearances from all the people in the Potter-verse were nothing short of delightful. You breathed so much life into them even when they appeared only briefly. I especially adored Mrs Figg and I knew there was more than meets the eye to Minerva's startling confession and spectacular demise.
Your Harry was so charming - eager and naive and sweet. And your Snape was convincingly brilliant and snarky. And the sex! So. hot. I could cut the UST with a knife in places and probably only Snape and Harry could have been more relieved than I was that Albus didn't interrupt them in Snape's rooms at the end.
I see others have been asking for sequels, and I'd be delighted to see one. But this story is perfect as it stands. I haven't enjoyed something so much in ages.