It's no secret that Applejack and Rainbow have been daring and betting each other to do various things, Rainbow finally won a bet.

Jetstream come across Applejack in a particular situation, instinct attempts to kick in.

In order to avoid public embarrassment with the whole school, Applejack ends up making a deal with Jetstream.

(I kinda got the idea from seeing a picture of Applejack tied upside down by thevincinator on derpiibooru)