This story is a sequel to Anarchy: Pony of Chaos, but you don’t need to read that one to understand.
Through the use of Discord's magic, Rainbow Dash and Applejack are currently expecting a foal. Heck, they even picked out a name for the little colt or filly! But not all is well on Sweet Apple Acres. Due to Discord's... well, Discord... Dash ended up the one set to carry the future Zap Apple, which now threatens her Captaincy of the Wonderbolts.
It's bad enough that the undead black sheep of the Apple clan is living and working on the farm, but now Rainbow has to give up the dream job she's been working for all her life!?
The real question is: Can she?
Part of the Anarchyverse.