Opening her eyes, Twilight saw down past her cascading rolls of flab the coat of a white unicorn, Rarity. "Rarity?! What are you doing here?!" the purple pony said perplexed and embarrassed.
"Uhh well...Pinkie..."
"I went looking for supplies, and then Spike said maybe Rarity would have the stuff we'd need to make a stand and stuff, so we got ourselves to Rarity's, and then she asked why I needed to make a stand, so I told her you're gonna be a trampoline, and Rarity didn't believe me so I brought her here!" Pinkie interrupted with a large shiny smile.
"Umm yes, correct Pinkie, now Twilight darling, just why are you so uhh out of shape?" Rarity said, wincing as she daintily poked Twilight's haunch, making sure this was real. Twilight bit her lower lip in shame, knowing that this was going to happen eventually, best to get if over with already.  
"*Sigh* I noticed some extra fat on my stomach and tried using a spell to to get rid of it, but it got messed up along the way and it backfired on me to do....this." Twilight lowered head in despair, her collection chins bunching up in a heap of layer after layer of soft flesh. "Well that's awful dear! Now...Pinkie, why exactly do you want to use our friend as a trampoline?" Rarity cocked her head, wanting to know just what the sporadic pink pony was planning. "Ooh I got an idea to help Twilight get over how big she is by letting her see how fun it could be to so shaky and jiggly and..."
"Bouncy?" Rarity added.
"Yeah! so anyway I thought that if we had Twilight help out around town by having all the kids play on her belly for money like this!" Pinkie then grabbed Rarity and trounced onto Twilight's fat laden gut.
"Wait Pinkie!" Rarity screamed as she was hoisted up into the hooves of her friend.  
"Hehehehahaha, see this super double fun with another pony on you!" Pinkie then did a double bounce, sending Rarity about 10 feet in the air. "Waaaaah!"
"Pinkie quit it! You could hurt Rarity doing that!" Twilight ordered flailing her rather nearly useless appendages now.

Stopping in mid-bounce, Pinkie grabbed Rarity to stop her from bouncing, Rarity glared with disapproval on being thrust into that, Pinkie merely smiled sheepishly, emitting a squeak sound in the process. "Wait a minute... where's Spike?" Twilight asked. "Oh he's out in the market, setting things up for our plan with the stuff Rarity gave us!"  
"And what was that?"
"Oh well it was just some large elastic material which I can see now is meant cover your umm expanded form, some planks of wood for a stand, and a hat and cane because Pinkie wanted to act like a circus leader." Rarity answered, questioningly speaking the last bit of info.
"I've always wanted to do one of those scenes where the ringleader tells ponies to gather around for some AMAZING spectacle!" Pinkie added in. Twilight rolled her eyes at her friend's logic.
"Well whatever, so...are we gonna get me over to my inevitable embarrassment now?" Twilight asked.
"Oh don't be so self deprecating Twilight, I'm sure everypony will love using you as an entertainment device." Rarity said, wincing as she tried not to insult her friend in such a delicate state of emotion.
"Not helping Rarity." Twilight gritted through her teeth.
"Wait, darling... can't you just teleport yourself there?"
"Well...no, I don't think that'd be a good idea, I don't know who might be where I'll end up, I may end up squishing some pony, and seeing a half ton pony come up from out of nowhere might be problematic for me..."
"*sigh* So I guess we're going to have to push you then." Rarity sighed as she realized her day was to be filled with strenuous physical labor.  "Alright time for another go." Pinkie said with a slightly lesser amount of enthusiasm then she normally had, considering what she felt the first time she did this.

"With the aid of another pony, Pinkie found moving her flabby friend somewhat easier. This pushing continued on for 4 minutes, making considerable progress, based on how much they had moved  last time.  "Heeaaah Uurrrgghhh! Huff huff pant, Twilight I'm sorry but, I don't think I can do this any longer...at least not without a break." "Oh that's okay Rarity, we're here!" Pinkie responded, as they found out there had already made their way into the town square. "What is that?!" "Is that a pony?!" "Is that the librarian?!" A number of ponies shouted and screamed upon noticing the blob of purple fur, which was odd, as Twilight had gotten into the middle of town square and had gotten no reaction until it was pointed out by Pinkie that they had gotten there.

"Oh no..." Twilight muttered closing her eyes, awaiting the worst. "Everything set up Spike?" Pinkie asked to the baby dragon, seeing a rather well made stand with a sign saying "Pony Trampoline 2 bits fillies and colts 5 bits for adults, 5 min. each." "Yep! Got everything up and ready to go, now you're sure this work Pinkie?" "I pinkie promise Spike, no pony can resist my speeches!" the perky pink pony promised, making a crossing motion over her heart and touching her eye. "Twirling the hat onto her head and taking the cane, Pinkie stood on her hind legs and shouted. "Come one come all! See the amazing First EVER Pony Trampoline! Given to us by our very own amazing librarian, Twilight Sparkle!" Many gasps and "oh mys" were made, ponies were flummoxed at how a pony could attain such girth. "So, who's first?!" Pinkie cheered, waving her cane at the crowd of ponies. The ponies looked weary, unsure if this okay to do. "I'll try it." said a small blue unicorn filly.  "ALRIGHT!" Pinkie cheered, tossing the filly up into the air sending her down towards Twilight blubbery rolls. "Wooaah!" the filly screamed, but then was tossed back up as she landed on the expanse of fat, bouncing upon it, spinning and twirling with delight. "Hey I wanna get on!" "Me Too!" "Let me play on Miss Sparkle's belly!" and soon the crowd was throwing bits into a chest Pinkie had gotten, slowly filling up with the gold coins. "I don't believe it...." Twilight muttered. "They actually....enjoy this." Twilight then couldn't help but laugh from the immense sensation of so many ponies jumping on her, it was rather tickling.

"Wow Pinkie! you're a genius, we'll have our emergency budget back again in no time!"  Spike was ecstatic at the success that was going on. "Aw thanks Spikey, now if you'll excuse me I've got some bouncing to do!"  Pinkie then jumped a good 15 feet in the air and joined over 7 ponies in the fun. "Can you believe this is going so well Rarity...Rarity?" Spike looked around for the unicorn, only to find that she had in fact joined in with playing on his companion's blubber as well. "H-hey wait for me Rarity!" and soon Spike too climbed atop Twilight.

Hours went by, with the number of ponies switching in and out, taking turns jumping on the "pony trampoline", Pinkie, Spike, and Rarity went down to check to the bits collected. "498...499...500! Haha We did it!" Spike pumped his fist downward. "How much did we make Spike?!" Twilight said past all her flapping chins and jiggling flab. We currently have 600 bits for emergencies!" "600?! that's fantastic! Well then everypony time to get off." Twilight said, now wanting to stop being used as a plaything, even if it did make her a good amount of money in only a few hours. Trotting down to the ground, the remaining crowd of ponies reluctantly left, going back to their homes. "Well...I must say, Twilight it was rather fun and amusing bouncing around on your...fat." Rarity said, slightly embarrassed to say something rather ridiculous sounding. "Hehe your welcome Rarity, I'm just glad I got my funds back ohhhhh!" Suddenly Twilight felt a vibration surging through her body. "Oh no...." Twilight moaned. "Hmm? What's wrong dear? What's wrong with her?" Rarity turned her head to the other two who were backing away in fright. "R-rarity you better move back." Spike shuddered. "What? Why?" Rarity turned back towards Twilight, seeing her cheeks were starting to bloat up. Rarity winced as she knew something bad was about to happen. "BBBBUUUUUURRRRRPPPPPP!!!!!!!!!!!!! Twilight let out a truly monstrous belch, blowing Rarity's mane back into a straightened single spike of hair. Then even worse for Rarity, Twilight's flabby body surged forward, blasting into the unicorn and sending flying through the air into Pinkie and Spike 20 feet away. Waaahh!" the three of them screamed as they tumbled across the ground. Twilight continued getting fatter, her cascading flab and shelves of fat growing to fill up a decent portion of Town Square. Considering they had set up nearby the Town Hall, it was getting to the point where Twilight's rear end was reaching to the second floor of the establishment. The mare's hock's and legs were getting so enveloped in fat that they were sinking in the flab that came from them. Her belly was getting so big, and full of blubber that the space that she knocked Rarity to was getting filled by her fat. After about 20 seconds of growing Twilight had gone from a "petite" 1,300lbs to a staggering 6,700 or so lbs! Now big enough to swallow up 10 manticores in her rolls the pony was truly gigantic in terms of weight. "Wh-what in Tartarus?!...Twilight...How'd did you...Augh?!" Rarity blathered about, confused as to what just happened. "Ughh uurrrp that...*gulp* was one of the side effects of my spell backfiring." Twilight said groggily. "Well...how do we fix this, if you keep growing like this...oh I don't want to think of such a disaster!" "I think there were some solutions back at the library but, I'll have to go back to get the book." Spike responded. "Urgghh no time Spike!" "Ohhhh I need some food NOW! I feel so..empty." Twilight groaned. "Ain't that ironic, *sigh* alright I guess we should get the rest of the gang, we're gonna need help if we want to feed this blob." Spike said. "I heard that!" "Well alright, Pinkie, you go and get Rainbow Dash and Applejack, Spike and I will go and get Fluttershy." "Right!" Pinkie saluted then ran off. "Okay Spike hop on, we must hurry to ease Twilight's pain!" "Al-alright..." Spike said blushing as he, for the first time in his life, mounted his crush, and grabbed hold of her soft body as he got on top of her.