This story is a sequel to Cursed Crusader

One long year has passed since Sweetie Belle contracted vampirism. Apple Bloom and Scootaloo are out of school, and Twilight has been unable to find any cure for Sweetie's condition. As part of their promise to their bloodsucking friend, the Crusaders are set to find ways to live alongside her even as the years carry on. To start their quest they are headed to Canterlot, to seek Celestia and Luna's guidance and expertise on the subject. Of course, getting information from alicorns isn't always the easiest thing in the world...

One Nightmare Night the Cutie Mark Crusaders decide to stay out too late and take a fateful walk down the path to Fluttershy's house at the edge of the Everfree Forest. After getting turned around and wandering for hours, the three find a stranger in the Forest that knows the path back to Ponyville. However, the price to pay is a terrible curse on Sweetie Belle, one that threatens to ruin her life and the lives of her best friends. Despite that, the curse may have a chance to bring the Crusaders closer than ever before.