found: Merlin leaves Camelot, Gwaine goes with him til Arthur finds them
Looking for a fic I remember reading. In it, Merlin is annoyed with Arthur for some reason, and decides to leave Camelot and travel to Ealdor. Gwaine tries to persuade him from leaving, but when he can't, he decides to accompany Merlin. Everyone tries to persuade Arthur to go after Merlin. He is stubborn but eventually goes after Merlin. When he catches up, to them, Gwaine is like "What took you so long! I thought I was going to have to sit on him!" etc etc. Then Arthur and Merlin confess their undying love for each other etc.
Grateful for any help!