Curiosity Killed Starlight (Not Really)

Bzzt! Bzzt! A buzzing noise echoed through the room of Twilight‘s castle. I looked up from my book. A few seconds later, the noise came again.

Curious, I set down my book and followed the noise to one of the bookshelves. In between two books, a light pink glow faded in and out to the noise. I took both books out and found...another book? Why in Equestria was the book glowing and vibrating, though?

As soon as I opened it, the book froze. It stopped moving and glowing altogether. I raised an eyebrow in confusion before looking down at the pages in front of her. It almost looked like a diary, Twilight's name was signed in a few spots.

Looking closer, I also noticed the name of someone else, Sunset Shimmer. I'd never heard of her, and Twilight never mentioned her, so I decided to read what they had written. As long as nopony found out, I'd be fine.