Twilight get a letter from Celestia on a regular day, but it says that she must come to Canterlot immediately and with nopony else. Quickly, Twilight leaves Ponyville to aid Celestia in her time of need. But, when she gets there; it turns out what she raced there for, was not what she expected. As a matter of fact, she felt like just letting loose a thousand of parasprites in the castle for what Princess Celestia called her for. I mean out of all the ponies in Equestria...why is she in love with Sombra!?!

I don't know the name of the artist for the cover art...sorry