Disclaimer: Nope, still don't own MLP.
"Would you like me to explain?" asked Kimono.
Pink Sunsparkle nodded nervously.
"Have you ever wondered why you are heir to the throne? There are plenty of eligible court members, you know," Kimono said.
Pink Sunsparkle nodded again.
"It's because you are destined. I saw Majesty on the night you were found. She told me that… that you're her. Majesty. That I was to guide you. Soon you will be queen. Go dig outside the moat, you'll find something important there."
So Pink Sunsparkle obeyed. Trotting to the moat with a shovel, she sat down and began to dig. And, a few hours later (after much digging,) she did find something. A heart-shaped locket. She slipped it around her neck and galloped back to the library.
"Is… is this it?" she panted.
"Yes," said Kimono, smiling widely. It was the first time Pink Sunsparkle had seen her smile like that. It was little scary.
"This is it. Come," Kimono gestured, and gracefully trotted up the spiral stairway, Pink Sunsparkle not-so-gracefully bounding behind her. Kimono led her out of the castle (Pinkie Pie, who had finally found Pink Sunsparkle following Kimono, had strongly objected to this,) and through the forest and, finally, to a large field, at the end of a rainbow.
"Wow…" Pink Sunsparkle gasped.
"Come on, we're going to the human realm," said Kimono.
"Humans… wha?" Pink Sunsparkle wondered confusedly.
Kimono laughed.
"Just follow me."