It all seemed to be finished, Sunset Shimmer had been defeated by a magic rainbow laser, and she tearfully apologized and said she wanted to learn a new way through friendship and Twilight asked her new friends to help the defeated bully to learn while she and Spike returned with the crown to Equestria, after celebrating the formal of course. When the formal ended Twilight said goodbye to her friends and she and Spike stepped through the portal to return home, only to walk into the statue. They missed their chance and were trapped in the human world.
With no known way home and unable to communicate with their friends the two Equestrians have to adjust to earth life while searching for a way to reopen the portal while dealing with a repentant Sunset Shimmer.
(Hiatus Note: I currently have Four projects on A03 Archive and have not had the time to write here lately. Will return to this once one of those projects is more complete)