Celestia is gone, and now Nightmare Moon is doing her best to act as a benevolent leader in Celestia's place under the ever present support of her husband Big Mac. Tonight is the first time that she has visited his family since her ascension. Applejack is less than happy about this, and Granny finds the whole thing hilarious. Family drama ensues.

Sequel: https://www.fimfiction.net/story/548288/nightmare-moon-creates-trot-topic