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.