By "WriteousBro."

>That time of day again.
>Party time.
>Sugar Cube Corner.
>You open the door.
>Cakes, cakes everywhere.
"Hello, ladies!"
>"Hiya, Anon!" "Hello!" "How are you doing?"
>Six glutonous girls lay sprawled out on the floor sprinkled with frosting and cake crumbs.
"I brought another cake from home. I made it myself."
>You set the cake on the table.
>Dear Celestia, they've put on weight. 
>Rarity, Twilight, and Fluttershy are lying about slothfully, engorged bellies spilling over of the floor.
>Applejack and Rainbow seem to be having an eating contest with Pinkie Pie as the judge. A giant chocolate cake sits at the center of the table, and the two are rapidly gorging themselves on the delectable treat.
>"Set it on the table over there, Anon," Pinkie Pie says, looking up from the contest. She waddles over and you set it on a nearby table.
>"Anon, are you well?" Rarity inquires. "You seem to be staring."
>Indeed, your mouth is agape and your eyes glazed over. You snap out of your stupor.
"No! I was just . . . lost in thought."
>Rarity's squishy stomach hangs low to the ground, squeezing against the floor.
>Twilight is munching on a cookie, her globulous orb of a belly on full display as she lies on her back.
>RD seems the thinnest, with only a potbelly plowing into the table in front of her.
>Applejack seems to have absolutely gorged herself on pies and treats, her thundering thighs 
and belly, squashed into the table like Rainbows, a testament to that.
>Pinkie and Fluttershy . . it's impossible to tell who's bigger. Their massive spare tires flow around them like giant doughy pillows, their butts rise like piles of spongy bread . . . hnnnng.

>You walk over to observe the eating contest.
> Applejack and Rainbow Dash are making quick work of an enormous chocolate cake.
"Hello, ladies."
>Applejack swallows a bite of the confection and replies with a belch, followed by, "Hiya, Anon!"
>Rainbow barely looks up from gnawing on the delectable treat, determined as ever to win this contest.
>Multispectral mane splotched with chocolate frosting and crumbs. 
>Wobbling gut squeezed between her chair, the table, and the floor.
>Applejack, noticing she is losing her narrow lead, suddenly returns to gobbling up as many bites of cake as she can.
>Pinkie Pie lumbers back over from the table munching on a cookie, residual pieces coating her lips.
>Jiggle, jiggle, jiggle
>"Go, Applejack! Go Rainbow! Ooo, I don't know who to root for, girls!" she exclaims, clapping her hooves, sending her foreleg flab a-shaking. 
>Belly wobbles. Hnnnnnnng. Again.
>Barely 1/4 of the cake left now. Applejack's side seems a bit smaller, but Rainbow's seems a bit precarious as well.
>All eyes on the eating contest now.
>Rainbow's side of the cake suddenly sags down, covering her head in the moist delicacy.
>Gasps.
>The mass suddenly and rapidly shrinks down; Rainbow's head reappears.
>Not enough left on the other side.
>Table is knocked over as RD's belly expands from the influx of the delightful, sweet, chocolate.
>Platter lands on the floor with a clatter.
>"Burp."
>Cheers! "Yeah, Rainbow!"

>Rainbow falls out of her chair on her side, suddenly asleep, snoring softly.
>AJ manages to stand up and totters over to a large jug of milk and begins chugging it.
>"That was the biggest cake I baked yesterday," you overhear Pinkie say. "But whoever ordered it never came back, and nopony else seemed to want it."
>"How strange," Rarity replies.
>Everyone returns to chomping on what remains of several batches of cookies, cupcakes, and other assorted goodies.
>Your cake seems to have disappeared at some point, no doubt eaten.
>Idle chatter dominates for a few hours, then everybody picks up their quivering, jiggly body off the floor and waddles home.
>"Aren't you leaving too, Anon?" Pinkie inquires.
"In a bit. Don't you mind me staying to help clean up?"
>Crumbs and splatters of pastel frosting cover the floor.
>You grab a mop and begin to wipe it up.
"I guess I can't say no to that, and I'd appreciate a little company for a bit longer."

>All that wobbling flab.
>Mmmmmmmmm . . . delicious.
>"Say, Anon, could get that bit under the table there? I've been having some . . . trouble getting into tight spaces lately," Pinkie asks.
>Yep, she's definitely fatter than Fluttershy.
>"Anon? Are you okay?"
"Sorry, sorry. Just daydreaming again," you quickly come up with.
>"You sure you're alright?" she asks again.
>No. It's time to make my move.
"The cake order. I made it."
>"What?!" Pinkie exclaims. "Then why didn't you come pick it up?"
"I wanted you to have it. Tonight."
>You walk over and stroke her giant, squishy belly.
>She notices the growing bulge in your pants.
>"Oh!"
"Should we go upstairs?"

>"Nah, we might as well just stay right here."
>With startling speed for her size, Pinkie pins you down beneath her spongy flab.
>Oh god that feels good, all those folds and smooth skin . . .
>"I kinda need a belly rub, Anon." A sparkle flashes through Pinkie's eyes.
"And I'd be happy to oblige."
>You carefully begin to knead the soft fat, rubbing it through your hands.
>"Mmmm, that feels good, Anon," she moans.
"And this will feel even better."
>You drop your pants and let your pocket snake hang free.
>Pinkie spreads her legs wide as you search for her marehood.
>You lie on top of her massive gut, giving it a few more massages before penetrating.
>Pinkie's giant belly jiggles back and forth as you thrust, mesmerizingly.
"I'm gonna . . ."
>"Yes, Anon! Yes!"
"Ugh . . ."
>You are both panting with exertion, Pinkie probably more so.
"That was great."
>"Yeah . . ." Pinkie dozes off. You pull up your pants and walk out.

The End