Nightmare Moon wasn't banished a thousand years ago. Equestria is not ruled under a single monarchy. Both rulers are not the kind and gentle ponies they were meant to be. Instead, two rulers are controlling their empires under different grounds. However, that may change when one of them asks for a unison, under the guise of creating a new super power. Something that rivals them, but ruled by both. To achieve this, it must be done through some unusual magic.

Written for the April 2019 Incest is Wincest Contest!