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.
Project Princess Infatuation, or Project PI, as Pinkie dubbed it, was the fool-proof plan to get the princess of friendship to fall in love with Rainbow Dash. Plans aren't always what they seem, however. Especially when they were made by Pinkie Pie