This story is a sequel to Sunset Shimmer's Redemption
Sunset Shimmer has just recently earned her redemption, AND been crowned a princess along with it after her role in saving the Crystal Empire from a the combined forces of King Sombra and an Alicorn Amulet wielding Chrysalis along with her army of changelings.
Not only that, she has even found a special somepony to call her own: Princess Celestia's adopted son, Prince Lockon Astros, whom Sunset had helped overcome his desires for revenge before her ascension.
Together, their love for each other will take down an unfamiliar path, but it will be one they are both willing to take as long as they have each other.
They will also have many surprises in store for them along the way, some of which will involve their friends as well. Including the appearance of an ancient enemy.
(Quick Author's note: This story is predominantly in the Romance and Slice of Life categories. But there will be a point in the plot that will push this story towards the boundary separating the Adventure category from Slice of Life. I am saying this because there can't be a story that is both Adventure AND Slice of Life. But I will not say anything more than that, since I don't want to spoil anything for you guys.)