Full Circle 

Edward Elric returns with amnesia. He has lived the past four years as Auric, a Gatekeeper. But there are some battles that only he can fight. Will his friends be able to awaken Ed, and what happens to Auric if they do? RoyEd. Eventually.
Keywords: shounen ai, yaoi, boyxboy, fanfiction.net, edward, mustang, roy, boys' love