Once in a great while Leapling day affects all the ponies of Equestria, Earth ponies become unicorns, Unicorns become pegasus and Pegasus become Earth ponies until the sunsets!
How will this effect the mane six and worse, how will leapling day ever end if nopony knows where Princess Celestia is!

Contains some mild adult themes in one scene describing the connection Earth ponies feel to every other pony.