Title: Harry Potter & the Knights of Merlin's Keep
Author: Navigator aka Muggle
Location: http://groups.yahoo.com/group/knightsofmerlinskeep/
Story Code: tt, tG, MM - Minor erotica
Description: When Camelot fell, Merlin took Excalibur and hid it within his keep, a realm not entirely within this world. He entrusted an order of Knights to guard it until a new king could retrieve it and rebuild Camelot anew. But if evil got ahold of Excalibur, darkness would reign for near eternity. Harry gets caught up in the prophecy and needs the help of Ron, Hermione, and a few new friends to prevent evil from getting the sword. The ancient order of knights sends help in the form of a new student and unlikely hero. Bill Weasley is the DADA and falls in love with someone unexpected and Draco Malfoy becomes even more dangerous. Slash impending. Harry/OC, Bill/OC, Ron/Hermione.
And for the record, I know the description is pretty cheesy, but I couldn't think of anything better without giving the whole story away.