The timeline in this story will follow what we could see of King Sombra's universe in the Cutie Re-Mark episode, but with a significant change: instead of a seemingly never-ending war, war ends upon both parts reaching a hard agreement that would bring peace and tensions. Luna would stay at the Crystal Empire by marrying Sombra, and she would make sure things didn't take a turn for the worse. While also trying to reform the villain by her side.
[Cover image is not mine, if author wishes for it to be removed then I shall do it]
Thanks to my best friend/proof-reader Faithy, I would be lost without you girl <3