Rarity had always known she would have an arranged marriage—such was the life of a princess, after all. She just hadn't expected her wife to be a sphinx or that she would actively avoid her, and not just because she loves books.
Twilight is a human in a world of monsters, although she's never met one. So when she finds a vampire dying on her front lawn one day, she's not sure what she's found. A new friend? Or her demise...
Princess Celestia finds a baby Changeling Queen during her travels. She had intended to bring her back to Canterlot only temporarily, until she could find the hive the Queen belonged to. For now though, the Changeling Queen was just Twilight Sparkle