Princess Luna ordered the Tantabus to torture her dreams every night so that she would never consider returning to the dark path she once trod as Nightmare Moon.

Luna should have remembered just how difficult it was for her to obey rules before she used her own essence to create what was, in effect, a smaller, more headstrong version of herself.

The Tantabus is determined to follow the true purpose of her command, no matter the consequences, large or small.

Or very, very small.

Now with a reading by ABagOfVicodin (who is open for fanfic reading commissions)
Done to go with the episode Do Princesses Dream of Magic Sheep?

Editors: Tek, Peter, Hilltopper2, Winston, Monarch Dodora

Now on Equestria Daily