As an ancient alicorn trapped inside a library, Princess Twilight spent many a century dreaming of being rescued from her prison. Now, finding herself in an entirely new Equestria, she realizes she'd never planned for somepony to actually succeed...
Princess Twilight Sparkle is married to Rarity but sadly she was married to her title first. After another grueling session of diplomatic drama all she wants is to get back to her lover and apologize for being gone for so long. Again.
When one fateful search through the Everfree Forest leads Rarity to a secret library inhabited by the spirit of an ancient alicorn princess, she realises that it may be time to start believing in fairy tales.
Life is like a train ride, don't you think, dearest? Destinations will change, trains will be caught and missed, but there will always be somepony willing to journey with you—so long as you let them.
For Twilight, the increased lifespan that came with princesshood had forced her to outlive her friends, but thanks to Rarity, she will learn that centuries could be lived in but a single day.