Beauty and the Beast?

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Howdy all you lovely folks! I lost a rather good fic a while back and have had no luck finding it again. It was a AU with Sherlock being the Beast and John being well...not the Beauty, more of the hapless rescuer of his drunken sister. Like how in the original version it was the Dad who got locked up first, this time it's Harry. John and Sherlock end up laughing and I think Sherlock's laughter scares John? Maybe. All I really remember is I stopped reading it when there was danger, which is a terrible place to stop! Permanent cliffhanger.

If anyone can track it I'd be forever grateful!