Ava Williams, a born and bread New Yorker, has been a hardcore pegasister since the beginning. She owns a online shop where she makes costumes for conventions. But when she's transported to Equestria as her favorite pony, Twilight Sparkle, what will she do? What will happen when she falls in love?
Jason Barnes, a journalist for the New York Times, is secretly a brony. He writes fanfictions, proofreads for others, etc. But something has always been missing in his life. He doesn't have anyone special in his life. He's searched far and low, but no girl catches his eye. But when he's transported to Equestria as his least favorite pony, Flash Sentry, will a certain princess take his heart?

Teen just in case.

Luna, princess of the night, is in her bedchambers, ready to go to bed for the next night. She lays on her bed, wondering, what if I was the eldest sister? What if Tia was banished to the sun? What if I ruled all?
Celestia, princess of the sun, is at Twilight Sparkle's new castle, helping her set up her new library. She uses her magic to teleport a book, labeled, "Alternate." She opens it to find a spell to switch her sisters' duties. Without thinking, she takes it home, only to see that she is the younger sister.