Sweetcheeks

Sweetcheeks by Anon The Writeslut AKA Writeslut The Anon.
Note that "BREAK" signifies where the document was originally separated for 4chan.
Done based on request.

>”What a way to get rejected…”
Lyra Heartstrings sat with cheeks in palms, on the couch in the living room of Ponyville’s premier confectioners shop, awaiting it’s owner and her marefriend. She was more than a little depressed over the loss of her dream job as she had always wanted to play as part of the Canterlot Orchestra.
>”All because I got red faced and ditzy after I thought of Bon-Bon’s stupid, mushy, wonderful, huge flanks… Mmpf…”
It was true. Her intent was to remember her marefriend’s parting words as she left to meet the talent scouts. All was well until she remembered all the ways that she loved her special somepony. ALL the ways…
To be fair, Bon-Bon’s rear end was quite well known to be one of the best in Ponyville, being even more generous than Pinkie Pie’s, without the flab. It was shaped perfectly: being plush and bouncy, the perfect consistency for digging one’s fingers into…
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Lyra was broken out of her booty-trance by the sound of the door opening. In walked the pony of her affections, looking as curvy as ever.
>”Heya Harpflanks!”
>”Heya Sweetcheeks.”
Bon-Bon took a seat next to Lyra, letting out a huff, and relaxed. She turned to Lyra.
>”Whew! Tough day today. Lots of new orders to fill. Can’t wait for tonight’s sess… ion? Oh no, Lyra! Don’t tell me you didn’t get the spot! You trained months for that!”
>*Sniffle* “Yeah, I got, um, distracted and I choked.”
Bon-Bon looked sympathetic. She leaned towards Lyra and held her in an embrace.
>”Don’t worry, they’re the ones missing out. Tell you what, you pick tonights ‘activity’, that always seems to cheer ya up!”
Lyra smiled. Bon-Bon was supposed to pick tonight, though she still felt a little sad.
>”Alright sweetie, I have to go start the next batch. You think long and hard about what you wanna do tonight, and I know how much you love my rump…”
 Smacking her ass as a tease to Lyra, Bon-Bon left a blushing unicorn to decide their fates…
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Later…
Although Lyra and Bon-Bon were deep lovers, they still possessed their own rooms. While most nights, they slept together in one of the rooms, depending on who chose the direction of their ‘escapades’, sometimes said escapades left the bed too ‘messy’ to sleep in, In which case they moved to the other room to sleep.
Lyra lay on her room’s bed, trying to come up with a plan for tonight.
>”Ok, to start. To start… Hmmm… Oh, I know! To start, what do I love about Bon-Bon?”
ButtsButtsButtsButtsButtsButtsButtsEtc.
>”Alright, It’s pretty well established that I like her butt in pretty much every way. But I need something different, something new, something better than Bon-Bon’s butt…”
Unsurprisingly, the only thing she could think of that was better than Bon-Bon’s butt was, well, MORE of it!
>”But how am I gonna get more of Bon-Bon’s rump?!”
The mirror pool was under guard, and usually a bad idea, so the only other option was making the one she already had BIGGER!
>”How am I supposed to make it bigger?!
The junk that filled Lyras closet shifted, causing the doors to open and a bicycle pump to fall out. Lyra saw this and felt a smile grow on her face as her imagination soared…
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Even Later...
>”Alright Harpflanks, what you got planned better be the best thing ever!”
>”Oh but Bon-Bon, I thought up something incredible…”
As the two lovers entered the unicorn’s bedroom, the two began by removing their shirts. As they sat on Lyra’s bed, the two removed their pants, socks and bras. As Bon-Bon moved to take off her panties, Lyra stopped her.
>”Panties on, Sweetcheeks.”
>”Ooh, that means you got something kinky planned…”
>”Yes I do! Now, close your eyes and lay on your belly…”
As Bon-Bon complied, Lyra took hold of the pump she had stashed behind her bed. Creeping behind her marefriend, Lyra used a thumb to pull aside her panties, causing Bon-Bon to give a quiet ‘mpf’. Lyra inserted the hose and let the panties slide back into place…
“Geez Lyra, that’s cold. And kinda small too…”
Lyra giggled as she took hold of the pump’s plunger. Things were about to get HOT. And BIG.
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The first few pumps went unnoticed by the cream earth pony, but Lyra was immediately entranced. Already, the perfect rump was plumping up bigger and rounder, calling out to her to play with it. But she hadn’t planned on stopping there. More pumps sent the ass jiggling and wobbling as it neared thrice its original size. Lyra started to hyperventilate to calm herself down…
>”Alright Lyra, enough teasing! I can hear ya huffin’ and puffin’, staring at my butt, so I’m coming over there to mush it in your face!”
>”I wouldn’t mind that much…”
Bon-Bon stood and turned to Lyra, but paused as she took in the sight of her lover: Lyra was rubbernecking, as if she was trying to look at what was behind Bon-Bon. She was also clenching a bicycle pump, frantically pumping it. Bon-Bon’s eyes followed the hose, noticing how it snaked around her and up into her-
>”W-what?”
Her flawless booty would be comparable to two large exercise balls. Her cutie marks were stretched out and distorted. Her hands instinctively flew to the rear of each cheek, maybe a little too fast…
>*SMEK!*
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Both Bon-Bon and Lyra squealed as the rump was sent quaking from the impact. Pressing her hand deeper in an attempt to stop the shaking, she only succeeded in causing the rump to creak like a full balloon. Lyra felt herself grow wet from the sights and sounds being presented to her, and soon she would be able to touch it…
>“Lyra! I know you love my butt more than everything, but this is going way too far!”
Lyra stopped pumping and gave the hose a tug, causing it to pop out of Bon-Bon’s butt. It was time to put on the act…
>”I’m going to have to find a way to let the air out… Lyra, wait here and try to think of another thing we can do that doesn’t involve blowing me up. I’m going to my room, maybe one of my spy tools can help me…”
>”You do that, Secret Agent Sweetie Butt...”
As Bon-Bon made for the door, she noted that her rump was rubbing against itself, making squeaks with every step. It felt strange but good, the way her ass wobbled and creaked with every action.
>*Squek…*
Bon-Bon grunted, something had impeded her progress. Looking behind herself she noticed the problem, was BEHIND herself. Her huge rear was stuck in the doorframe!
>”Oh! It seems you have decided to stay!”
As Lyra began to move towards the stuck rump, Bon-Bon tried harder and harder to force her way through the door, however she only succeeded in causing her cheeks to squash together, exciting Lyra more.
>”Come on Bon-Bon! It’ll be just like all those other times you let me play with your butt!
It was impossible. How could she have slipped up so badly? She was a trained Agent, yet here she was being outsmarted by her horny housemate and lover, who wanted nothing more than to toy with her hugely inflated posterior!
Bon-Bon sighed. Not totally resigned to her fate, she braced for whatever Lyra would have in store for her…
Lyra dove for tha booty.
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Lyra grabbed at the butt, feeling it squish through her fingers, giggling as it squeaked and molded like a full balloon. Bon-Bon grunted, a slight blush present on her face. She’d had her rump get squeezed like this, but those times before were nothing compared to the intensity present this time… Bon-Bon mentally scolded herself, this was too strange to allow for enjoyment! She would persist through the-oh my Celestia that feels good…
Lyra had taken to spreading each massive cheek apart, fighting against Bon-Bon’s strained panties to get a good look between them. She gasped as she saw her future target. It was huge and puffy, juicy and plump, looking even tastier than she had ever seen it! However it wasn’t quite wet enough, and if she ate dessert first, there wouldn’t be any dinner!
Using her magic to pull Bon-Bon out of the doorway, Lyra guided her marefriend to the bed where she told her to lay down as before. Bon-Bon complied with a snort as she lay on her stomach, presenting her plump flanks to her captor.
>”Alright Lyra, try to at least make it worth it to you.”
Lyra chuckled as she took hold of Bon-Bon’s tight panties.
>”I’ll make it worth it to you too, sweetcheeks…”
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Lyra pulled on Bon-Bon’s panties, causing Bon-Bon to gasp. Lyra giggled, this was one of Bon-Bon’s favorite things to start off with. Letting go of the stretchy undergarments caused them to snap back into place, leaving a faint red mark and the new effect of causing a whole lotta wobbling. Lyra thought that past this point, she should go with the classic butt-fun formula her and Bon-Bon had perfected over many sessions, to give Bon-Bon some sense of familiarity with the situation.
Bon-Bon moaned in approval as Lyra pushed the butt in every which way, creaking and groaning as it was rubbed all over, quivering like fresh Jell-O-. She gave Bon-Bon a quick pat to warn her of what was to come, prompting Bon-Bon to begin kicking her legs in protest.
>”Nooo Lyra! Not while I’m like this!”
>*WHAP!*
A light red palm marked Bon-Bon in response to the impact, her tongue lolling out as she gasped and panted.
>”Nooo!”
>*WHAP!*
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Bon-Bon was spanked over and over and over again and again and again. Each time Lyra brought her hand down on her fat rump, a torrent of pain and pleasure erupted out of nowhere.As each slap stacked layers upon layers of stimulation upon her, she found herself about to climax. So hot, so close so full and tight…
The spanking stopped. Bon-Bon moaned in euphoria and agony. Her rear was super sore and red all over, after all the abuse, but she secretly loved it. What she didn’t love was how she was being teased as so.
>”Lyraaaaa, one moreeee! Pleeeaaase! I need it right now! A-aah…”
>”Nah.”
>”W-what? W-why you little-“
Lyra was past paying attention at this point. Instead she had climbed upon the massive rear and sat down, bouncing gently. Bon-Bon fumed. She was deliberately taunting her, and she would not stand for it!
One secret-agent-secret-speciality-spin-twister-later...
>”Bon-Bon! Nooooo-*BLOOMP*”
Bon-Bon ground her rear end into Lyra’s face, pinning her between the bed and the massive booty. She grumbled, upset that she would not be able to play anymore. With a frown on her face, Bon-Bon commanded:
>”Now lick me.”
>”Gnuh uh.”
>”Lyra, now.”
>”Gnoh.”
>”Come on!”
>”I wunnuh pleh summore!”
>”No!”
>”Pweese?”
>”Gah!”
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Bon-Bon was getting impatient. There had to be some way to get Lyra’s mouth up her clit! Shifting around on her ballooned arse, it creaked and squeaked as Bon-Bon tried to force it in. Lyra persisted, even though her muzzle was now slightly off center. Bon-Bon sighed, she scanned the room, as Lyra made it a point not to let Bon-Bon cum.
Bon-Bon smirked as she found her target, luckily within reach. The air pump. With a soft chuckle, Bon-Bon slid the hose between Lyra's thighs and under her panties. Slowly, the Candy Mare began to pump...
>"MMPH!"
Lyra's mouth shot open as she squealed in pleasure, causing her to unintentionally glomp on Bon-Bon's puffy pussy. Bon-Bon moaned as she felt pure bliss, with a mind sunken into lust, she only was half aware that she was still pumping...
Lyra's rear ballooned outwards as Bon-Bon pumped her full. It only grew to half the size however, seeing as big rumps were an earth pony thing,  No, Lyra had the stereotypical "Canterlot Pudge", meaning she had the slight amount of extra belly fat that unicorns typically developed as part of being the academic race.
Needless to say, that extra bit of fat seemed the perfect place for the rest of the air to inhabit.
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Lyra's belly began to swell, appearing as a growing turquoise bump, between the creamy pony's legs, yet still Bon-Bon pumped away, Lyra squealing and moaning as her muzzle was worked into Bon-Bon's vagina. Bon-Bon panted, struggling for breath, It was almost here...
That was good. Mostly because Lyra was looking a little blue in the face from the squealing and moaning and being sat-on-not-quite-able-to-breath-but-sorta-able-just-not-enough. Yeah, that's a thing. Lyra's belly had swollen to the size of one of Bon-Bon's buttcheeks, and Bon-Bon had taken to squeezing it between her thighs for some extra pleasure. Both ponies creaked and groaned, at their capacities and so squishy. Lyra was once again playing with her butt/prison/captor as she had managed to free an arm. Blushing, sweaty, beaten, swollen, full, about to cum and somewhat suffocating, Lyra raised her hand for the final push...
>*PAP!*
The spank was timed perfectly with Bon-Bon's latest pump, both ponies shuddering as the orgasm seemed to splutter and die...
Only to come back on steroids!
Bon-Bon squealed in euphoria as she fell back, creaking as her butt was squished against the floor and dripping with juice. Meanwhile, Lyra lies, wiggling her legs and clutching her swollen tummy as she leaks all over the floor, moaning loudly.
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>"Hah hah, Ly-ra, that was incred-hah-ible."
>"*Gasp*. I know! Let's do it again! But bigger!"
Bon-Bon grunted, coming down from the climax but still fully in the afterglow. She eyed her massive rear, noting how her panties had created a large indent, her skin reddening from the prolonged tightness underneath as she tugged at them absentmindedly.
>"No time Lyra, I have to meet with a contact tomorrow. I'll need my rest. Also, I can't go out looking like this! How do you get the air out?"
>"Relax, I'll take care of everything. You go to sleep on the couch, while I try to find a way to keep you from sticking out tomorrow. Just trust me on this Bon-Bon."
>"Alright Lyra. Teleport me."
And she did. Bon-Bon found herself in the living room. Taking care to avoid knocking anything over with her massive booty, she picked out a nice blanket and flopped on the couch, out like a light.
Later...
>*KNOCK KNOCK!*
Bon-Bon awoke to the sound of banging. Red eyed and still sleepy, she sauntered over to the door, not noticing the fact that she was topless and still in panties. Her butt was still huge too, can't forget the butt. Slowly Bon-Bon opened the door. Only to be shocked wide awake
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>"Agent Lampshade?!"
The mare in fron of Bon-Bon was massive, with hips the size of the ones she... had... last... night...
>"Ah, Agent Sweetie Drops, I see that you too have suffered from the affliction."
Bon-Bon was now aware of butt. Why butt? Why other butt? Why can't not brain feblectivly?
>"We're not the only ones however. The whole town's been hit with this crazy pandemic.
True enough, as Bon-Bon looked past Lampshade, she noted that the entire mare population of Ponyville was running around in their underwear with asses the size of medicine balls. Screaming could be heard.
>"The Horror!"
>"So tight..."
>"I can't reach an itch!"
>"Don't pop it!"
>"The Worst Possible Thi- maybe I should make a new line..."
>"Somepony please! Rub my butt!"
>" Help me! I've got a wedgie!"
Bon-Bon gaped. Then fumed. Then screamed.
>"LYYYYYYYYYRRRRRRRAAAAAAAAAAAAAA!!!"