I'm looking for stories where Merlin talks to Arthur (or Arthur finds out earlier) about some of the things that have been going on without him realizing. Specifically telling him about Morgana plotting against them. In the process I imagine the truth about Merlin's magic may come up as well...
[I'm only half-way through season 3 so I don't know how things actually come about, but feel free to rec fics that spoil later things]
Nothing with a sad ending please.
Gen (canon background pairings) or Merlin/Arthur please.