A few month ago, Rainbow Dash found Twilight stargazing up on the balcony of Golden Oaks library. Ever since then she comes back, every night, and listens to Twilight's lectures on everything astronomy.
Ever since Twilight's ascension, she's been having unusual urges. Like a weird desire to grow flowers, and she can't seem to stop chewing her wings. Turns out, her newfound magic comes with the instincts to match, and instincts are a powerful thing.