This story is a sequel to The Life and Times of a Winning Pony
The changeling attack on Canterlot left the city devastated. Chrysalis and her swarm brought Equestria to its knees, and it was only through powerful magic and more than a little luck that the pony civilization survived.
Yet, an attack of this scale requires careful planning and preparations--and information that only guardsponies close to Princess Celestia would have. Guardsponies like Major Nimbus Gust.
For an infiltration on this scale, Chrysalis needs an agent with more independence and free will than any changeling under her control possess. Fortunately for her, though, not all changelings in the world are under her control—and for the right price, some would even be willing to help.
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Part of Chengar Qordath's Winningverse.