Sunset Shimmer and the human Twilight Sparkle decided to come to Equestria to visit Princess Twilight Sparkle, Equestrian Spike, and Starlight Glimmer. While there, the human Twilight asked about something her pony form doesn't have, but Princess Twilight does: alicorn wings.

The two Twilights then went on to solve the mystery of the strangely absent wings. It didn't go well, especially for one of them.

My entry to the "Most Delightful Ponidox" contest. I'd place my bets on it placing in the bottom three if I were you. Easy money people.