Time seemed to pass slowly for the six ponies, cooped up as they were. The voice demanded something from the ponies each day, usually something to do with eating vast quantities of food. After the first day, the voice gave separate instructions for Pinkie Pie, quickly realizing that she could eat far more than her friends. The first day's challenge had been hard, but the six mares had somehow managed to devour every single mouthful of cake. Twilight wasn't sure how it had been possible.

A pattern began to emerge, the voice would wake them, in what Twilight assumed to be in the morning, and would give them the days instructions. Then, they would carry out his, the voice was clearly male, instructions. After that, the ponies would talk, or play games for a long while, until the voice returned, and turned down the lights.

Three days had passed, and Rainbow was getting extremely antsy, trying to fly off her excess energy, but failing. It was about the middle of their day. Rarity lay on a couch, groaning in pain as Fluttershy tried to massage away the ache in her distended stomach.

All six of the ponies had had to eat an incredibly large stack of waffles this morning for breakfast, coupled with an equally large lunch. The voice, so far, hadn't dictated dinner, but Twilight secretly knew he probably would as soon as their stomachs could handle the excess food they were eating.

Even now, after only three days, Twilight could see that they had gained weight. Pinkie had gained the most, since she ate twice what the others did, and Rainbow and Applejack showed almost no sign of their recent caloric intake.

Despite Pinkie's constant motion, Twilight could already tell that her figure would be the first to fall, since her stomach was almost constantly full, as per the voice's instructions. Twilight looked over at Rarity, wincing at the hard ball her friend's stomach had become during lunch.

Twilight looked down at her own pained belly, wondering if anypony was out looking for them. She hoped they would be rescued soon, because she knew that if they weren't, they would gain massive amounts of weight in only a few weeks. Somewhere, though, Twilight knew that they probably wouldn't be found for some time, since the voice had always seemed so confidant.

Twilight sighed, and carefully manoeuvred to her feet, wincing as her stomach protested, "How are you feeling, Fluttershy?"

"Feeling better now, after my nap. You should try napping after meals, Rarity, they would probably help ease your discomfort."

"I couldn't nap during the day, Fluttershy. That wouldn't be fitting of a fashionista."

Fluttershy smiled weakly, "I know, but it's just the six of us here, since the voice leaves during the day. No one here would be offended."

Rarity shook her head, "We'll soon get out of here, Fluttershy. I want to be able to return to my normal routine as soon as possible."

"Of course. I'm sorry."

"For what? You're just trying to look out for me, and I appreciate that."

Fluttershy smiled, then squeaked in terror when the familiar static filled the air.

"I have an extra challenge for you ponies."

Rarity bit back a groan, and Twilight had to catch herself as well. Apparently her assumptions were right, although it was premature.

"I want you ponies to build the biggest dessert you can in two hours. Work together, and use the power of friendship to help you," The voice's tone was flat and sarcastic, "I will be back to judge it. Consequences will be decided then."

The static stopped, and the ponies sat on various pieces of furniture, and began to plan.

(LINE BREAK)

Twilight brushed the sweat off of her brow, glancing at her massive dessert in front of her. It was a huge, four tiered cake, covered in thick frosting and edible decorations. It was gorgeous, and far too large for them to eat in a single setting, Twilight realized. Her heart sunk, realizing what the voice probably wanted them to do.

Just as the realization hit, the static filled the air again, "Good work, girls. I didn't think you'd do as I asked."

"Why wouldn't we? You could seriously hurt our families!" Applejack snapped, blowing a errant strand of mane out of her eyes.

"I suppose that's true. Now, since you ponies were so quick to do what I asked, I'll be nice."

"Are you going to let us go?" Fluttershy asked hopefully.

The voice laughed, "Of course not. I have a lot more in store for you. But, instead of making you eat all of this cake at once, I want you to eat only the cake for as many meals as it takes you to finish it. You are not to eat anything else but this cake, and trust me I'll know if you do, until the cake is completely gone."

The six ponies stared at the nearest camera in shock. Applejack stamped her hoof, "This is getting ridiculous! I demand to be let out of this prison!"

"Yeah!" Rainbow exclaimed, "I want you to let us go, and leave us alone!"

The voice paused, before laughing again. "As if I will let you out until I'm done having my fun with you. I will ignore this outburst, but if they keep happening, you will need to be punished."

"With what?" Rainbow asked smugly.

"Magic."

Suddenly, Rainbow was lifted into the air, a light blue aura surrounding her. Rainbow struggled, but was unable to get out of the magic user's hold. Her friends watched in horror as her figure began to expand. At first, only a small layer of fat gathered around the athletic mare's stomach, but then the rest of her started expanding too. Rainbow Dash began struggling anew, but that only seemed to exacerbate the spell's effect. Soon, the magic slowly lowered the now fat mare on the ground, where Rainbow lay panting.

Her stomach was globular. If she stood, it would now reach past her knees, rubbing against the inside of all four legs. Her plot had doubled, taking the majority of the weight. Her Cutie Mark was now huge, doubled in proportions. Her legs were fat, and a double chin had developed. Even Rainbow's wings, once so muscular, had gained a thick layer of fat Twilight wasn't sure she would ever lose.

Twilight glared at the camera, about to say how horrible the person was, before the voice started speaking.

"Now you girls understand. If you magically try to help her, more weight will be added. If you try to magically speed up your metabolisms, I will make sure they convert whatever you're eating into 100% fat. I promise you, that I will not do this every time you misbehave, but now you know what's in store for all of you."

Rarity burst into quiet sobs, Fluttershy looking close to doing the same. The voice continued, "Oh, and I would start eating that cake. If it's not gone by the time I come to get you up in the morning, two more of you will suffer the same punishment Rainbow Dash here just did."

With that, the static stopped. Twilight Sparkle suddenly knew that the pony they were dealing with was sick and twisted, but also very powerful. Magic that permanently changed somepony's body like that was extremely difficult.

Twilight sighed, "C'mon, Rainbow. You lay on the couch for a while we get started. We'll eat in teams until the cake is gone. Who wants to go first?"

"Ah will, Twilight," Applejack said.

"Me too!" Pinkie Pie bounced.

"I'll eat, too. Rarity and Fluttershy, keep an eye on Rainbow. We'll call you when it's your turn."

Author's Note

I hope you guys like this story. I'm really excited to finally post it. My family/friends/normal site I post things to wouldn't understand.