Applejack is invited over to Rarity's boutique one day so her and Rarity can have a bit of a private chat about the incident that took place with Trenderhoof; even when the issue with that incident has been solved, so Applejack is for the moment confused and a bit worried about the predicament that might take place.
As their girl-talk comes to its climax, a turn of the unexpected events take place that changes the way Applejack and Rarity view each other as to more than just friends.
Plus, it may put an end of Applejack being a sexual nomad with no destination.

Image from Google.
Proofread and Edited by: Mist Shaker