My Beautiful Dark Twisted Fantasy

Sugarcube Corner's dark basement

"You see, Mrs. Cake?" Pinkie said, tapping her hooves together, "This town is diseased. Ponies trotting about, wasting away their days with friendship, eating ungodly amounts of sugary foods while consuming an endless supply of media drivel... This is what they deserve."

"B-but Pinkie!" Cup Cake cried from her cage suspended from the ceiling, "They're just ponies! You can't judge them from what they eat, or what they watch on TV!"

"Oh, can't I?" Pinkie cackled. She pressed a button on her desk, and a dozen screens behind her came to life, "As you can see, THIS is what happens when you loosen the restraints! THIS is what happens when the bottomfeeders are allowed to do as they wish!"

"You're insane! What about the... The transformations! The growth, and the mutations?"

"It was all in their minds already. I gave them their disgusting dreams, I stripped away the boundaries, and this is their true form!"

"So why give them their minds back? Why not keep them trapped in lust for the rest of their lives?"

"I didn't give all of them back. Carrot!"

With a mechanical grind, a section of the wall opposite Pinkie slid away, revealing a darkened room. For a moment, everything was silent, then... STOMP. Something was in there. Something big. Cup Cake waited with bated breath as the sound grew closer, and closer... She couldn't wait for... Whatever this was... And whatever it might do to her...

Finally, the monster stepped out and into the light. Cup Cake gasped, "Carrot?!"

Her husband was 7 feet tall, more muscular than Hercules, and bore a penis at least three times his usual size. He snorted lustfully at the sight of his wife. Deep in his enchanted brain, he recognized her as his mate. His dick twitched at the thought.

"Yes, Mrs. Cake. You see, I'm not just planning the end of ponykind, I'm planning for its rebirth. And you," She pointed at the caged mare, "Are going to be it's mother!"
Carrot neighed dumbly. His wife gulped.