Destiny is a fickle thing. Sometimes things are up, at others - it is down. Was it destiny that Luna was banished to the moon to save all of Equestria? Only time can tell.

Luna goes a bit insane when her life gets flipped upside down. Princess or not, life threw her some really bad turns. When she comes back, she's traumatized by her ordeals. Can one little unicorn be able to fix it? Twilight Sparkle has to try, she cant just leave Luna all messed up. However, she gets in much deeper then she ever expected. Things change, but can she keep up?

Edit: Gave it a mature rating and added the sex tag for later chapters.