Sounds like Lupercalia, Hogwart's Style by enchanted_jae. The first part of the Verse can be found here: http://enchanted-jae.livejournal.com/333191.html#cutid1 (http://enchanted-jae.livejournal.com/333191.html#cutid1)
edit: Secondary Pairing in this is Theodore Nott/Hermoine, but I still think this is the story you are looking for.
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timeasmymeasure
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Date: 2013-07-15 05:09 am (UTC)edit: Secondary Pairing in this is Theodore Nott/Hermoine, but I still think this is the story you are looking for.