By: Europaguy
“Ahahaha,” Katie Cunningham laughed as she swirled the cup that she was holding around in her hand, watching the shrunken person inside stumble about. “So, this is what you were planning to do to me, huh?”
Angrily slamming her fists against the glass cup that had imprisoned her, Katie’s younger sister, Savanah, swore loudly as she pounded against the hard surface, her face flushed red in rage at her perfect plan having been foiled.
After having moved out and lived alone for a few years, Katie had finally returned to her childhood home where her mother and sibling still resided. For most of her youth, the larger, gassier Savanah had lived as a tyrant, bullying her older sister and making her life a living hell. However, the tables had somewhat turned as Katie had dedicated her early adulthood to getting bigger. Indeed, while she used to be a short, skinny little girl who was at the mercy of her chubby, slob of a younger sister, the 21-year-old had herself gotten significantly thicker and now boasted an immense rear end that put Savanah’s to shame, a pair of jiggling, bouncy globes wobbling behind her with every step. With a head full of long, beautiful brown hair and her arms broad and muscular as well, Katie had relished in the disappointment that had fallen across her little sibling’s face when the bbw teen had noticed just how drastically her former punching bag had changed.
This turned out to be for the best, as Savanah had apparently concocted a nefarious plot to shrink both Katie and their mother, where the older sister, who’d sniffed something odd in the drinks that her mischievous sibling had handed her, promptly threw the drink back into the unsuspecting teen’s face, where she’d watched in horror as Savanah shrank down to only a few inches in height. Promptly scooping up the unconscious young woman, Katie had begun to interrogate her after she’d come to, where it became clear what the slobby teen’s plan was.
“Why were you going to do that to us?” Francine, the Cunningham mother, asked with sadness in her voice as she watched the cup with pitiful eyes. Savanah had always been a problem child, and it was no secret that the mom easily preferred her sweeter, older, overachieving daughter.
“You bitches have always looked down on me!” Savanah snorted as she began to claw against the glass. “So, I wanted to take you down a notch and mess with your stupid, perfect little lives!”
“What were you going to do once we were shrunken like this, anyway?” Katie asked, holding the clear class right up to her face. “Kill us? Eat us?”
“Hahahah oh no, much worse,” the shrunken bbw snickered. “Remember what I used to do to your Barbie Dolls, Katie?”
An expression of horror spread across the older sister’s face, where she slowly lowered the cup away from her head as she placed it down on the counter with her sibling still trapped inside.
“You’d fart, shit, and stick those things up your ass…” Katie stammered. “You’d do that your own sister? Your own mother?”
“Happily!” Savanah added. “I’d happily watch you pipsqueaks suffer….watch your back, Katie, because as soon as I get out of here…”
“You little bitch,” Katie began, shaking her head in utter disgust. “Oh no, I couldn’t possibly let you out now.”
“But what can we do with her then, Kate?” Francine asked, still in utter disbelief about the existence of the shrinking technology.
“Well, how about we give her a taste of her own medicine, Mom?” the older girl asked, before bringing the cup holding Savanah around back to her massive ass. “Surely you remember how much she used to bully me with her nasty farts!”
Nodding, Francine watched as Katie pressed the cup right against her jiggly booty cheeks, which were barely contained within the tight pair of grey yoga pants that she’d casually worn over to her mom’s.
“K-Katie?” Savanah chuckled nervously, backing up to the side of the glass cup as she shrank away at the sight of her sibling’s now-enormous backside. “What are you doing?”
“I’d wondered why you were always so gassy,” Katie smiled, rubbing her bubbling stomach. “After gaining 200+ pounds, I now know what it was like being you, Savs!”
A deeply muffled fart blasted out from between the older Cunningham’s tightly-contained buttcheeks, blasting the open end of the cup and echoing throughout its glass interior as the container’s occupant was scorched in an intense, sulfuric wind.
A sadistic smile slowly grew across Katie’s face as she heard a distinguishable gag sound from the glass, letting out an audible giggle as she let out another gnarly fart directly on top of her sister. Removing the cup, the giantess raised the container up to her face and burst out laughing at the sight of Savanah clutching her nose and mouth and retching against the side of the glass surface.
“Payback STINKS, doesn’t it?” Katie snickered, giving the cup a little shake as her younger sister glared daggers at her.
“F-fuck you, Katie!” the bully of a bbw spat. “Just wait until I get out of here, then you’ll see!”
“Huh? See what?” the older sibling feigned innocence as she returned to open end of the glass to her big booty and merciless released another gas bomb into the small, enclosed space, relishing in the disgusted noises that her sister was making.
“Wow, she certainly doesn’t like being on the receiving end, does she?” Francine laughed lightheartedly, fanning the air around her. “Whew, Kate, those smell just like your sister’s!”
“It does feel good watching her squirm to the smell of my farts for once,” Katie smiled, now pulling down the stretched waistband of her tight yoga pants.
“What are you going to do now?” the Cunningham mother asked nervously.
“C’mon, Mom, I’m just getting started,” the chubby brunette replied, now pressing the jar between her meaty asscheeks, allowing the cup to pass between heavy glutes somewhat.
Savanah began to whimper at this point, her nose wrinkling at the foul smell of her sister’s naked rear end as the cavernous crack that had become her once-small sibling’s ass opened up in front of her. Luckily for her, Katie was a little more hygienic than herself.
“So, Savs, was this the view you were planning to give to me and mom?” the giantess asked as she began to strain herself, trying to conjure up another wave of flatulence.
“Haha okay, Katie, I’ve learned my lesson now,” Savanah gulped fearfully, trembling under the sight and smell of her elder sister’s booty. “P-please just let me out.”
“Nah I don’t –uuugghhh- think you’re done,” Katie sighed as she let out a loud, rather wet-sounding fart that cascaded into the jar, blasting the shrunken occupant inside with a searing wave that smelt of hot sewage.
Savanah screamed for the first time as she was pelted with flecks of sweat and real shit, causing the tiny to gag loudly as the vile smells that she’d normally force onto others were now being redirected at her. Her desperate coughing seemed to only egg on her normally-nice older sister, who just kept letting out fart after loud, booming fart into the cup that was beginning to smell worse by the second.
“Alright, Kate, I think you’ve made your point now,” Francine said again, watching as her favorite daughter next plucked a wheezing Savanah up and out of the glass.
“Wait, Mom, I’m going to put her inside!” Katie snickered, nodding down towards her big butt. “Lord knows she was going to do this to us.”
Savanah was just about to set aside her massive ego and beg to be released, only to find herself dropped into the back of her sibling’s tight pants and even tighter mint-green panties that had been wedged deep in that massive ass for most of the day. Screaming as she fell back onto the sweaty garment, the tiny’s eyes widened in horror as Katie then released her hold on the waistband, letting those tight pants snap back and forcing Savanah hard against the giantess’ jiggly backside. In pitch blackness, the younger sibling whimpered as she was forced to slowly slide into her sister’s buttcrack by the mounting pressure behind her, her nose twitching as the hot, humid, stinky air as the distinct stench of ass wafted at her.
“Mmm you feel kind of good wedged up there,” Katie commented as she gave her booty a little shake. “I can kind of see why you wanted to do this to us now.”
Savanah screamed in frustration as she squirmed in the sweaty environment, utterly humiliated at her own plan having gone south. The exact things that she had been planning to do to her mother and sister were now happening to her, irritating the shrunken teen beyond belief as she coughed at her sibling’s stink. Eyes watering, Savanah wasn’t at all enjoying the taste of her own medicine as her anger began to simmer down into fear.
“Gosh, I can hear her screaming from here!” Francine remarked, holding a hand over her nose to shield her nostrils from her daughter’s farts. “But Katie, dear, do you think Savanah is okay in there?”
“Mom, who gives a crap?” the older sister laughed in response, waddling over to the living room couch and dropping her big booty down hard on one of the cushions. Katie licked her lips at the sensation of her weight forcing her tiny prisoner even deeper into her buttcrack, where Savanah’s pious screeches had reached an all-time high as the tiny found herself face-to-face with her sibling’s massive asshole right in front of her.
“K-Katie, I’m sorry!” the bully of a bbw murmured as her eyes squinted and blinked in the darkness, her sight fixated on the wrinkled flesh of her captor’s gnarly anus winking back at her. “I-I’ve learned my lesson, see, I know better now!”
Katie ignored her sister’s pleas as she sat back on the plush furniture and squeezed out another rumbling fart that echoed thickly from between her juicy thighs, cackling as she fanned at the air at the resulting stink and rapid struggles of her tiny victim.
“Hold onto your nose, Savs, I think these are going to be real wet!” the giantess teased as she continued letting out a barrage of gas bombs upon the shrunken woman wedged deep in her crack. The more she tortured her struggling sister, the more Katie began to enjoy the writhing and suffering of the girl who’d once caused her so much misery.
“So, um, Katie…” Francine began awkwardly from the doorway leading to the living room. “What are you planning to do with her? I mean don’t forget, she is your sister…”
“I’m shocked that you feel even a shred of sympathy for Savanah, mom,” the older sibling sighed with a shake of her head, standing up as she eyed the stairs. “Think of all the bad shit she did to you. Remember when she dutch-ovened you that one morning, causing you to pass out and miss that one job interview?”
“Huh, on second thought, have fun,” Francine said as she shuddered at her many horrible memories with her younger daughter. “I’ll be in the kitchen finishing dinner.”
Smirking as she ascended the stairs, Katie’s head was now spinning with mischievous ideas around how to make her sister’s experience as a tiny even more unpleasant. Spotting the bathroom door at the end of the second floor hallway, the giantess immediately knew what she was going to do.
“Hey Savanah, remember that time you made me watch you take a shit with my barbies stuck in the toilet?” the older Cunningham asked down towards her gelatinous ass, where her sister was still trapped. “That was all the way back when I was only 10, but I still feel like avenging my plastic girls…”
Savanah’s screams could be heard again as Katie promptly tugged her tight, tight pants down to again reveal her massive, swaying behind. Spreading her meaty cheeks, the giantess pinched her doll-sized sibling’s messy, dirty-blonde locks and tugged the writhing young woman out by her hair, smirking at how damp her little body now felt.
“Damn, must have been sweaty in there,” Katie grinned as she pulled the screeching prisoner up to her large face, where she was able to see Savanah’s face for the first time since she’d introduced the bully to her big bubble butt. Tears streaming down her angry, reddened face, the pudgy bbw glared daggers at her older sister as Katie noticed some sparse brown splotches throughout the girl’s body.
“Oops, is it dirty in there?” the giantess asked innocently as she looked Savanah up and down, seeing clear signs of smeared-on excrement coating her younger sibling. “I thought I was wiping pretty well…I guess with a butt this big, it’s just hard to properly clean it!”
“Let me go, you bitch, I can’t take it!” Savanah wailed as she kicked her thick, naked thighs about. “Your ass friggin reeks, are you really going to keep doing this to your sister?”
“That’s funny, you’re acting like you weren’t about to do the same thing to Mom and I,
” Katie sneered sarcastically. “Nah, sorry sis, I think I’ve got a bunch more paypack coming your way.”
Now dangling her the plus-size Barbie that was Savanah over the toilet bowl of the washroom that she’d just entered, Katie grinned as she held back laughter at the sight of her panicking sister. She clearly knew what was about to happen.
“Cannonaball!” the chubby overachiever yelled as she released her grip on her sibling’s hair, watching as the girl that had terrorized her childhood dropped into the currently clear toilet water below, screaming all the way down. Katie had forgotten if Savanah could swim, but was soon put at ease as the coughing and sputtering young woman swam her way to the surface.
“Dammit, Katie, the toilet? Seriously?” the enraged bbw yelled as she glared up at her older sister. “What are you planning on doing to me? Flush me as revenge for flushing your goldfish back when were kids?”
“So that’s what happened to Goldie!” the giantess growled, before relaxing into a smirk again. “No, Savanah, I’m going to treat you to a little stargazing.”
“What the fuck are you talking about?” the tiny moaned from the toilet as her out of shape body struggled to tread water.
“Yeah, it’s a great night for stargazing,” Katie continued. “I heard that there was going to be a full moon.”
With that, the plus-size older Cunningham turned around with her ass facing the toilet, giving her tiny sister a horrifying view of her gargantuan butt as it swayed gently with the subtlest of movements, the smooth, plush surface of each cheek beaming down like not just one- but two, pale moons.
“N-no,” Savanah muttered in disbelief, her rage again subsiding into fear. “Katie, you can’t possibly-”
“Annnnd lights out,” Katie cackled as she plopped her behind weighty on the porcelain seat, the entire second floor of the house trembling her as increased mass hit the toilet hard. Savanah was plunged into darkness as that hefty booty covered the bowl from all light, though in the dimness, the increasingly-worried tiny could faintly make out the dank, dark buttcrack hovering above her that had now spread to reveal her sibling’s pulsing, very-ready asshole.
“K-Katie, no!” the horrified bully screamed in protest. “I know what you’re about to do, and please, please, please have mercy! I’m sorry, okay? I’m sorry!”
“You know what I’m about to do because you were going to do the same thing to Mom and I,” the older girl huffed. “Now, you’re sorry, eh? Sorry for what?”
“Sorry for farting on you all the time when we were kids, sorry for torturing you and bullying you and all that,” Savanah wailed. “Name it, and I’ll say sorry for it, just please-”
Katie didn’t let her begging sister finish as she pushed out a heavy, bassy, well-echoed fart into the toilet bowl below her, her spread ass allowing the horrendous blast to exit her big butt unchallenged by her meaty cheeks and allowing the confined space below to immediately fill to the brim with her gas. The loud, echoing gags from below only egged the giantess on to fart again and again as she began rubbing her now-pudgy stomach, which had been gurgling loudly the entire drive up to her Mom’s house.
“Do you remember blowing up this very bathroom, and then locking me in it with the stench of your fresh dump?” Katie asked down between her legs as she kept up the crescendo of thick, heavy toxic blasts from her pulsing anus. “Or perhaps the time you super-glued my nose to the inside of your asscrack. That was the most embarrassing hospital trip ever!”
“I’m sorry, I’m so sorrryyy!!” Savanah sobbed as she splashed helplessly in the darkness of the covered bowl, choking half to death as her sister released yet another smelly bomb right on top of her. “I’m fucking sorry just please, stop it!!”
“Sorry, as you can imagine, I’m having a pretty tough time hearing you,” Katie grinned with an almost-sadistic smile as the small bathroom filled with the loud echoes of her repeated butt blasts. “Try speaking up, I- ughhh- can’t seem to hear you clearly.”
“Fuck you, bitch! This should be me farting on your stupid face, not the other way around!” Savanah continued to screech in anguish, tears of shame, frustration, and disgust rolling down her reddened face. “You’ve ruined everything, this was supposed to be my day!”
“Yeah well now it’s your day to repent,” the giantess shrugged uncaringly. “A day for me to cleanse you with my -ugghhhh shit- purifying expulsions."
A putrid, revolting fart shotgunned a barrage of real drops of excrement from Katie’s ass into the toilet water and the girl treading in it, showering Savanah in a smelly rain of pure stink. The bbw retched loudly at the new odor amidst the foggy, already- revolting stench floating around the inside of the toilet, struggling to keep her head above water as the fumes were causing her to go dizzy.
“Uh-oh, looks like that footlong Coney that I had at Sonic is about to pass,” Katie snickered as she rubbed her lower gut. “Ahh prepare for some rain, sis.”
Having barely recovered from the last chocolaty-blast, Savanah looked up just in time to see the head of a massive, thick turd begin to crown out of her sibling’s butthole. Eyes twitching in terror, the tiny swam to the other side of the bowl in a pathetic attempt to avoid the shitty onslaught that Katie was about to reap inside that toilet.
“You can’t be serious!” Savanah protested as she pressed her body against the porcelain walls of the bowl, utter fear in her trembling voice. “You can’t seriously be shitting in here with me!”
The thick, dense log of Human waste began to emerge from between those mountainous ass cheeks as the horrified tiny could only watch on helplessly, where even Katie had gone quiet for a second as she struggled to push the apparent monster out. After nearly thirty seconds of watching the massive, brown turd slowly slide out of the giantess’ butt, Savanah let out one last scream as it was pinched off and dropped in slow motion towards the water below.
“Oh my God, nooooo!!” the tiny squealed as the impact of the shit hitting the water’s surface sent a tidal wave in her direction, splashing into Savanah and dragging her back into the middle of the pool with a powerful rip current. Disoriented in the darkness, the struggling young woman ended up slamming into something warm, squishy, and very, very smelly. Gagging loudly as the force of the wave had smashed her right into the very shit log that she’d been trying to avoid, the once-confident bbw retched and choked at having to touch her own sister’ filth, desperately trying to push herself away from the excrement.
Unfortunately, the clay-like surface of the log was almost like quicksand, and the struggling woman’s arm became stuck in its nasty, brown surface.
Katie giggled as she felt her food baby hit the toilet below with a loud plop, laughing harder at her evil sibling’s anguished screams seconds later. Fanning the now odorous air around her, the giantess wondered what she was going to do with her shrunken sister in the long run, her mind now dancing with tantalizing ways to get back at Savanah as revenge for all the times she had to suffer in the past. Should she eventually find a way to revert the former-bully back to her normal size? Katie wasn’t sure yet, but for the time being, she planned to sit there on the toilet and relish in the scream, moans, and sobs of the sadistic young woman who had planned to do the very same thing to her and Francine. Letting out another rotten fart to add to the stinking concoction that Savanah was currently drowning in below, Katie Cunningham sat back and relaxed as she enjoyed the sweet, sweet feeling of retribution.