Board Thread:What If?/@comment-5674726-20130803001002/@comment-5674726-20130814112254

For fanfic, www.fanfiction.net has a large Merlin section, as does www.archiveofourown.org. There's also a lot to be found on livejournal.

The vast majority seems to be Merthur but there's some non-slash to be found.