My Little Demon Slayer (MLP×KNY Crossover fic)

After seeing the mirror to the human world, Starlight wonders whether she could make a spell that can also work as a portal to another universe. RD, Pinkie, and Fluttershy (whom were looking for Twilight) accidentally get in the way of Starlight's spell. Now they must figure how to survive in a world full of demons. ...