Once a true story, which faded to rumours, which faded to legend, which faded to myth, which faded to dust.

The royal sisters are the only know heirs to the crown...
But a single soul returns from the horrors of war...
A third foal heir to the crown was born, but over time his story was forgotten, he left the reins of Equestria to his older sisters, as he commanded their forces to bring peace and balance to the world around them.

After long consideration, Sunset Shimmer decides to return to Equestria to make amends. Everypony is very skeptical about this but Celestia decides on a test of sorts to see if she truly is sorry. She has to live with Twilight and Spike for 1 year, at the end of that year her fate will be decided by Twilight and Spike.

A HUGE shoutout to Love at Sundown by trahzo. That fic gave me the idea of writing a Spike x Sunset fic.