AU in which Arthur happened to have a little sister, Elsa. They grew up together, they were family. As children, they were rambunctious and had many adventures. But once Elsa's secret gets out, they can't remain in their childhood forever. Will Arthur remember his duty to the kingdom, or the duty to his little sister? Starts out when they're kids, then shows how they grow up.
Rated: K+ - English - Family/Adventure - Chapters: 6 - Words: 7,363 - Reviews: 11 - Favs: 23 - Follows: 21 - Updated: 2/25/2015 - Published: 7/10/2014 - Morgana, Merlin, Arthur, OC