(Story idea inspired and suggested by Chronicler06.) As Sunset Shimmer prepares for graduation, she is called to a meeting with Canterlot High's Superintendent, Neighsay. He reveals information that will change the lives of Sunset and her friends.
In Rarity's line of work, absolutely anything can inspire the next great style, up to and including: corporate warfare, cinnamon buns, fortunate coincidences... or simply being with your best friend.
Twilight and Sunset create a space inside the portal, keeping ponies as ponies and humans as humans. Then they bring their friends through to meet– themselves.
Twilight thought she'd had enough excitement for one day after meeting her human counterpart. Or so she thought until she was met with the uncanny feeling that Pinkie Pie was acting, well, a bit too equestrian.