It's on ff.net and is coauthored by the amazing Stella Malodi. (I'll probably crosspost this like crazy; it took me a while to remember how to lj, starting with remembering my password :D)
Title: The Unbroken Vase
Summary: It seemed odd that a simple quest for quiet would result in an 8 million yen debt. But what if it hadn't? This is the tale of Fujioka Haruhi and Morinozuka Takashi, the Third Music Room, a well-climbed tree, and an unbroken vase.
The Unbroken Vase