Becoming Magic

Based on BBC's Merlin, takes place post season 3 and leads in to season 4.
Arthur Pendragon has been crowned King of Camelot as his father's condition worsens. His coronation is celebrated with a fortnight of festivities.
Merlin shares some secrets and finds more acceptance than he thought was possible. His magic matures and he has trouble controlling it at times.
After an unfortunate encounter with Slavers, Arthur has demanded that Merlin take part in a training regimen including swordsmanship and hand-to-hand.
The Knights all know about Merlin's magic and have claimed him as their younger brother. Well. Except Gwaine, who wants more than friendship with the warlock.