If you haven't read any of seperis' Merlin fic yet, I highly rec all of it. I also love franticsga's Merlin air force AU Be Resigned (http://franticsga.livejournal.com/tag/be+resigned) I know it sounds kind of weird but it is really excellent and my favorite comfort read in this fandom is syllic's Three Tasks (http://syllic.livejournal.com/tag/three+tasks) which takes a little while to get going but is absolutely marvelous in the end.