Spoilers in the comments. I encourage them.

Applejack visits her cousin, Braeburn, to discover that he recently achieved something no other stallion can claim to have ever done.

Rated T for alcohol use and mild violence.

Based on a song. Normally, I'd post a link to it here. The title of the song spoils part of the story, so if you want to know what song it is, shoot me a PM.