[undergoing major MAJOR revamp]
Applejack is unable to help harvest apples for a month, the month in which she is needed the most. A storm of suffocating darkness creeps on the horizon, one that threatens to destroy every crop in Sweet Apple Acres. Big Macintosh calls on some old friends to help, in Applejack's stead.
Unfortunately, one of them is not as they seem, and means only harm towards a certain pegasus...

Prequel to my (unpublished) story, Guardian Angel (the title will make sense eventually)