"Who were they?" Twilight asks nopony directly.
"The one who stole your crown Twilight was Sunset Shimmer, and Emerald Night, the one who failed to steal yours was her brother, Sunrise Shimmer. Both are old students of mine." Princess Celestia says, and then goes on to tell how the two formal students became what they are now.
"If you don't get your crown back Twilight, the other elements won't work and Equestria is left without it's most powerful defense." Princess Cadance says. "You must go there and retrieve it before the portal closes and you won't be able to return until thirty moons." Twilights eyes widen but she nods.
"I am going to." Emerald declares.
"She must go alone, If more of you going, it might upset to balance of the universe." Celestia warns.
"Well, if twilight goes alone, she has two ponies to deal with, if I help her, she can focus on her crown as I fend off Sunrise." Emerald says.
"I strongly dislike your logic, stepbrother." Celestia says. Luna and Emerald chuckle.
"Why do you think I married him?" Luna asks. Emerald drapes a wing over her.
"I am a logical pony, surely you must understand that by now." He asks sarcastically.
"Enough talking, go!" Cadance says.
"I'll miss you." Luna whispers to him as he walks to the mirror, her face full of worry
"I'll miss you too. Relax, I actually went there during my years away. It is different, I'll say that." He says. Luna nods. Emerald nods to his sister as they walk through the portal.
On the other side.
Emerald steps out, his Emerald green coat turned into skin and Mane Hair on top of his head. With clothes of course. Twilight stumbles out, with spike in tow. Her skin is lavender like her pony form's fur and hair like her other form's mane. Her dress has her cutie mark on it. Emerald's crown turns into a five pointed ninja star.
"Welcome sister, to Canterlot High School. Home of the Canterlot Wonderbolts." He says. Twilight is examining her new body, pulling on her fingers. "You walk like this, and those are hands, and fingers, since there is no magic to pick things up, fingers and hands allow you to, and don't pick things up with your mouth, People don't do that."
"People?" Twilight asks.
"Everyone isn't a Pony, They are called people." Emerald explains. He helps twilight up and the siblings walk to the doors.
"This sure isn't the castile." Twilight says, as they enter the building. Emerald chuckles.