And oh yes, yuletide author reveals for 2007 have happened, and my story was for edonohana, in the Onmyoji fandom, and titled "Matsu--"
You do not need to know the canon to read it. It's set in Heian Japan, Seimei is an onmyouji (a court magician) and Hiromasa is his perpetually-befuddled courtier friend, and they solve supernatural mysteries.
Many thanks to keelieinblack for the beta!
( Historical prattling under the cut )