Educating Arthur

Merthur. When a family from Camelot move to Ealdor after King Uther's fall, everyone is suspicious and highly unwelcoming. Merlin doesn't mind Gaius' family, but maybe he's just blinded by his enjoyment in teasing the youngest one, a prat named Arthur, who seems quite incompetent at things any normal person could do, something Merlin takes great joy in telling him, repeatedly.