Dating should be simple; like hanging out with a friend only more mushy. And dumb. Rainbow Dash doesn't need or want any of that. At least that's what she says, but the way her heart jumps around Twilight might just disagree with her.
Twilight wakes up to find that she has lost her voice completely, and even worse, her magic. All the while, Ponyville is being absolutely annihilated by a unicorn that looks exactly like her.
A year before moving to Ponyville, before making friends... a certain rainbow-maned pegasus mare crashed through Twilight's window, and into her life. Left with bruises, and a case of amnesia, Twilight soon finds herself looking after the stranger.
During a week-long vacation, Applejack is surprised to learn that Twilight and Rainbow's plans are no different than if they had stayed at home. Maybe a little bet can fix that.
(Humanized) After their decisive actions during Chrysalis' Invasion of Canterlot, Princess Celestia gives To Vinyl and her 'sister' Applejack an other Mission. One they would have hope it never befalls to them.