After Twilight went back in time to warn her past self not to freak out about what might happen in the future, came back and went home to the Golden Oaks Library again; strange things happen to the studious mare.

This story was inspired by the cover art.
Cover art from SenseiDezzy
Link:

Photo Finish tells a little story about a filly she once knew. She knew her well but now she is but a shadow of herself.