The world was going to burn, just like Canterlot was, and all the friendship in the world couldn't have them now. She struck when they least expected it, how they least expected it, and even then no one could believe it was really her that was behind it all. Now, with the world threatening to fall to one little mare, princesses gone, Elements of Harmony lost, Doodle Bug is allowed into the palace to question the mare behind it all: Her dear friend Smoky Waltz.

AKA MLP:FiM original character fanfic? I'm 2020? It's more likely than you think!