Starlight has decided to have a slumber party, since she now has a group of friends to do so. She and Sunburst decided to start off the festivities by summoning a Demon.
It turns out pretty good.

Based on what I thought was happening during the season 7 trailer, so it contains spoilers for that I guess,
Rated Teen for swearing.
This is now Part of the Cornerverse-MLP Universe. because why not?