Sitting in the middle of the main room of Ponyville's library was a now massive 400lb pony, taking up more than five ponies worth of space. "Ughh... urrp" Twilight groggily belched, looking somewhat out of it oddly. "Yeah Spike I'm fine."
"What happened, you didn't eat any books did ya?" Spike said referencing his little poke at the mare's sudden increase in hunger just before he left, though now as he said it he wouldn't be surprised if she actually had eaten some of the books, given her current size.
"No, I just suddenly felt this...tickling sensation in my body and then my body just started to grow." Twilight said nearly groaning in the process, pushing her hooves into her neck and chest fat. As she did this, Pinkie, getting out of her shocked trance, walked from behind Spike, up to Twilight's blubbery gut and pushed her hoof into it, hearing a small "boomp" sound come from the fat and the resounding jiggle her action caused Pinkie giggled and soon divulged back into her normal self.

"Pinkie?!" Twilight screamed, only just now noticing her guest. "Spike, didn't I tell you I didn't want to be seen like this?!" Twilight waved her hooves in anger as Pinkie continued to poke and prod the mare's belly, greatly enjoying the sounds her hooves made when they smacked against the fatty tissue. Spike merely smiled meekly as he switched his view from the giggling mare up to his friend's angry and blushing face, no doubt caused by Pinkie.
"Well...I tried to but, she forced it on me!" Spike pointed his claw towards Pinkie Pie, biting his lower lip, hoping Twilight would understand. Twilight glared at her assistant, becoming frustrated by him attempting to put the blame for this folly on somepony else, she was about to respond until a certain pink pony gave her opinion.
"Oh don't be so hard on the dragon Twilight, You should be happy to be so big and bouncy, now you got you're own trampoline, you! I mean how awesome is that? Though I guess you can't use it, but still so much fun for all your friends!" Pinkie said as she was now suddenly bouncing on Miss Sparkle's large belly, flipping and spinning with each bounce. Twilight's eyes dilated at this point, wondering just how even Pinkie could think this was....good.

"B-but Pinkie, you don't understand, I can't be seen like this! I'll be the laughingstock of Ponyville, and I can't exactly study the magic of friendship if I can barely move!" Twilight was once again, going into her panic mode, believing when the bond between her friends could be broken.
"Oh, quit being so silly, It doesn't matter to me how big you are and it won't matter to the others, and if they does matter they'll have to deal with Pinkamena Diane Pie!" Pinkie said patting her right forehoof to her chest, giggling in the process.
"Your name is Pinkamena?" Twilight asked, being seamlessly knocked out of panic by knowing Pinkie's full name.
"Well, duh I told ya so many times before, don't you remember?" Pinkie said, looking at her friend in her cheerful, goofy manner.
"No...I don't." Twilight said, completely sure she had never been told of Pinkie's actual name, in fact she had always assumed Pinkie WAS her name.
"Eh whatever I'll think about all this later, just gimme what ya bought Spike." the mare commanded wiggling her hooves towards her assistant, wanting to finally satisfy her insatiable hunger that rung her insides like a bell.
"Oh of course." Spike happily replied, knowing his friend's hunger had stopped her neurotic babbling."Here's 20 carrots, 30 turnips, 10 daffodil sandwiches." Spike climbed up the many folds of the pony, throwing them into her gaping maw. Twilight with an almost gluttonous behavior, quickly and merrily devoured the palatable vegetables, munching in pleasure as about 6 or 7 ponies' worth of lunches went down her throat.
"Mmmh Spike that was delicious...wait...*sniff sniff*" Twilight stopped, smelling an intoxicating and alluring aroma, that had somehow alluded her attention until now.
"Oh yeah!" Pinkie cheered as she remembered what brought her in the first place. Bringing her hoof on the top of the box at the base of the doorway to the home, she made it flip into the air, making it land squarely on her back, bouncing up to Twilight's head, with not a single wobble of the box that laid atop her back, she brought it up to Twilight's face and opened it up.
"Oooohh...It looks delicious...." Twilight moaned as her a waterfall of saliva cascaded from her mouth. The sight of the masterful detail that had been put into this cake alone made her want to eat it, but the smell intensified this feeling tenfold! "What kind of cake is it?"
"Oh it's my super duper bestest best favorite Twilight!" Pinkie clamored as she bounced atop Twilight's chins, which luckily due to the mass of fat that laid in them did little harm to Twilight. "It's a triple chocolate fudge cake, with pink icing, my favorite! Oh I can't wait to share--" As she said this Pinkie had closed her eyes in excitement, by the time she had reopened them after saying "share" she saw that Twilight was gobbling up the entire cake and before she could even respond Twilight had engulfed it in all its glory, cake smudges all over her cheeks. "--it..." Pinkie said dismayed at not being able to taste such a delicacy, true she had full intention to sell it in the first place, but since it was a personal delivery to her good friend she thought the least the two could do was share a few pieces together.
"Aw Twilight! I wanted that cake too!" Spike groaned, wiping a few crumbs and icing off the pony's left cheek he stuck his claw in his mouth and savored what little bits of the devoured cake he could taste. Twilight in response belched.
"BURP!" Ah that was absolutely lovely Pinkie you and the Cakes did a great job baking it! Though....uhh sorry about not sharing some with you two, I just couldn't help myself?" Twilight smiled meekly, embarrassed by her ravenous behavior.

"Oh that's alright Twilight!" Pinkie said, hugging the mare. "A cake that good is bound to make some ponies go craaaazy for it, why I remember when I first had it oh boy you shoulda seen me, even Gummy was surprised by how I acted at the first bite and you know how calm he is, which I guess makes sense cause alligators need to be calm to stay low in those murky waters all day, but anyway I was loco." Chuckling at the thought of imagining Pinkie being so ecstatic about something even her almost zen-like calm pet had shown a reaction to it, Twilight licked her lips as she asked her a question.
"About that cake...how much did it cost for Spike, Pinkie?" Upon hearing this Spike immediately ran up to the pink mare and clamped his claws around her snout. "Oh it cost him a pretty bit, it wammhh mmhmm!"
"Ohho don't worry about that Twilight, what matters is that your not hungry anymore r-right?" Spike sweated as he lied badly at that, to the 400lb+ pony. "Glaring rather disappointingly at her assistant, Twilight crossed her flabby forelegs, awaiting the truth. "Spike..." Seeing that she was obviously not going to take anymore lies from him, Spike bit his lip and took his hand off Pinkie's snout, as much as he didn't want to.
"It was 100 bits!" Pinkie pumped her hoof into the air, happy to make such a great sale of such a great cake.
"100 bits?! Spike, I asked you to get me some food not drain or entire emergency budget!" Twilight fumed as Spike cowered behind Pinkie as they stood atop her gaping navel ( I don't care if ponies don't actually have those, I feel like it's not bad if I give them one) "Urrggh, okay...how much do we have left?" Reaching into the bag of bits Spike used to hold their emergency's stash. Holding out the bits in his hand, Twilight counted up the amount.

"Only 100 bits?! Spike you used a fourth of our budget?!"
"Well I wouldn't have if you hadn't been so hungry all of a sudden, you should've planned ahead!" As the two began to bicker Pinkie, sensing that this could end ugly, and obviously hated to see her friends argue quickly racked her brain for some amazing Pinkie style idea to save the day! At least in her mind it would save the day, but helping her friends was good enough. Pulling an air horn from nowhere, Pinkie blasted the device right at the two bickering friends. *WOOOOOOOOOOOOOOOO!!!!* Twilight and Spike immediately stopped arguing to clasp their ears shut, their eardrums ringing in horrid pain at the thunderous pang of that dreaded device.
"AHHHH PINKIE STOOOOP!" Twilight screamed desperately as Pinkie oddly did not stop blowing the air horn despite the fact her idea of quieting them had worked. Blinking a few times as she realized what was going on, seemingly unaffected by the blasting noise, tossing the can behind to disappear into oblivion. She giggled a bit, sorry for the slight torture she made her friends endure.
"Hehe sorry, ok so you guys were all like "We don't have any money for emergencies and stuff like that!" Well I got a super Pinkie Pie idea to help you two!" She said bouncing atop her two back hooves.
"R-really? What do you have in mind Pinkie Pie?" Twilight asked, rather intrigued as to what her kooky friend had in mind. "I'd be glad to tell you Twilight!"