Sweet Celestia, I just imagined a scenerio where a grown dragon named Spike adopts a filly named Twilight and her younger brother Shining Armor (because their parents aren't around for whatever reason). Now THAT'S a complete age reversal @_@
It's So Cute That I Think The Song In my Mind While I Was Watching This Cute And Fine Piece Of Work... "My Big Sister, Best Friends Forever..." Oh.. I Crying, This Doesn't Has Words To Describe How Magnificent And Cute It Is!!
Where Applebloom is looking out for her little siblings Applejack and Tiny Macitnosh... Only in such a world, do we get, Sweetie Belle helping out little Sister Rarity.... Where the great Celestia had to banish her Big Sister and Usurp her from the throne!