Putting the Change in Changeling (Mature)

Luna paced back and forth, frantically speaking to herself.

Celestia yawned as the strolled into the royal chambers.

"Luna, what's got you so riled up?"

Luna stopped her pacing to look at Celestia.

"It's been over half a week without hearing anything back from him, dearest sister. What is something happened to him?"

Celestia chuckled.

"Luna, I'm sure you're over reacting... I doubt he found the Changelings. I mean, they DID get blasted pretty far out after the wedding..."

Celestia took her seat on the large throne before using her magic to habitually raise the sun.

Luna lowered the moon.

"Yes, but that was months ago, sister. There has been more than ample time for them to make a new established nest."

Celestia tapped her chin with a hoof.

"Maybe that book had given him an idea..."

Luna's ears perked up.

"Book? Again with this... Book. What was inside of it, anyhow?"

Luna looked a bit curious, but mostly distraught.

"It was a book about the known history of Changelings... All the tests we did, observations... Everything."

Celestia paused to look out a window.

"All information on them, up to date."

"And you just LEFT it in the Library!?"

Luna was steaming from anger.

"There are so many books in there, dear Luna. How would I have known that someone would have spotted it?"

"You left the key with the book."

Luna looked at her sister scornfully.

Celestia sighed. "Maybe Twilight and her friends know something that could help..."

Luna gave a yawn.

"We had best contact them as soon as we can... Who knows what kind of dangers lurk within the ranks of the Changelings."

Celestia magically poofed in her supplies for the letter.

"Dear Princess Twilight..."

Twilight and co. burst through the front doors of the royal chamber.

"We came as fast as we could, Princess!"

Celestia looked at the mane six with a solemn expression.

"Did you bring the book?"

Twilight levitated her copy of the research files out of her saddlebag.

"It's right here... Why do you need it? Did the other copy get lost?"

Luna shook her head.

"No, Twilight... It might be something far worse."

"Say, where's that Anon at? Shouldn't he be here with you?"

Twilight tilted her head some.

"That's the thing..."