"Pinkie Pie…can you come over to my house tonight?" Fluttershy said meekly as the two ponies walked through the bustling town of Ponyville.
"Sure thing, Fluttershy!" Pinkie replied happily. "What's going on? Are you having a PARTY?"
"No, not a party. I just have s-something really important to talk to you about. And it has to be in private. You'll come, won't you?"
"Of course, silly-billy!" Pinkie said, rubbing Fluttershy's head. "I gotta get going, the Cakes need me to baby-sit today. I'll see you tonight!" The pink party pony bounced off. Fluttershy sighed in relief and galloped home, raising her hoof to hide the fangs that were growing in her mouth.

For a long time, Fluttershy has kept a secret. A dark secret that all of Equestria would shun her if found out. But tonight, Pinkie Pie will discover this secret. And when she finds out, there'll be no going back.