The midafternoon sun shone down, bright and warm, on Sunnie and Cinderheart as they relaxed under a large tree. They’d grabbed lunch and decided to forgo sitting in the busy restaurant and instead head over to a little park just beyond the outskirts of Canterlot. Sunnie’s tummy burbled happily, filled with a hayburger and a large helping of hayfries, and she sipped at the delicious tea Cinder had prepared while looking out across the lake. She looked over at the littler unicorn, who smiled back. It had been an… interesting day so far. Sunnie was used to getting looks as she strolled and shopped, but Cinder… Cinder practically demanded attention, and Sunnie had felt eyes on both of them for the entire day. Not only that, but she’d been making comments about Sunnie’s rear and thighs, to the point where Sunnie had to gnaw the inside of her lips raw to stop herself from losing control.
“Want some more tea?” Cinder asked, interrupting her musings.
“Yes please!” Sunnie replied. The tea was wonderfully fruity and earthy. She’d never had anything like it, and she couldn’t get enough. “It’s the best I’ve ever had!”
“Good!” Cinder grinned as she poured the last of the tea into Sunnie’s cup. “I made it extra special, just for you.” Sunnie nodded her thanks, and guzzled her cup down, finishing with a sigh, noticing that Cinder was eyeing her pudgy belly, which was a little more bloated than normal thanks to all the tea and food. She shook her head lightly.
“Y-you said you were a potion maker, right?” She said, trying to hide her flushed cheeks.
“Mhm!” Cinder turned her gaze back up to Sunnie’s eyes. “I’ve been making potions for years. All sorts of things. Luck, charisma, things to help cure various ails, things to cause various ails, infinite hunger, weight gain, etc, etc.” Sunnie blushed even harder, and crossed her chubby thighs.
“W-weight gain?” Cinderheart nodded. “Why w-would you need to make o-one of those?”
“It depends. Sometimes a pony is dangerously underweight, sometimes they want a little more flesh on their bones…” Sunnie glanced away. “... and sometimes I just want to make them into a big sloshy butterball.” Sunnie’s head snapped back around to Cinder, who had placed her teacup down, and was leaning closer. “It feels so good to watch them jiggle and struggle to move… even better to touch them, rub every single new fold, kiss them all over, taste them all over…” Cinder’s hoof gently touched the outside of Sunnie’s thigh. She squeaked and squirmed, a rush of heat flooding her chest, her stomach groaning loudly, but she stayed firm.
Cinder ran her hooves along the curve of Sunnie’s thighs to her belly, rubbing and kneading as it continued to make noise. Sunnie fought back a gasp at her caresses, warmth spreading from her chest to the rest of her body. Her belly glunked outwards, very slightly. Cinderheart giggled, and kissed the top of Sunnie’s tum as it groaned and grumbled louder and louder. She became aware of a pressure inside of her stomach, growing more and more by the second.
“Oooh, yes!” Cinder poked a hoof deeper into Sunnie’s tum. “It should be kicking in right about now!” Sunnie let out a quiet moan. She felt full, more full than she could be after lunch and tea. She looked down in wide-eyed panic and arousal as her belly pushed outwards, very slightly. She placed a tentative hoof on it, and felt it vibrate gently.
“W-what did you d-ooooh?” Sunnie moaned, her front legs wrapping around her bloated stomach as it pushed out, inch by inch. Her belly felt taut, and springy, not fattening up but… inflating?
“It was a very simple potion. It’s designed to make you blow up like a cute little balloon… well, maybe not so little.” Cinder replied, a wide grin plastered across her face. She bent down and licked Sunnie’s deepening belly button, the sensation of her moist tongue enough to cause Sunnie to slip. With a loud GRUNNNNNNK, Sunnie’s belly jutted outwards, swelling rounder and larger, her forelegs now barely able to touch each other. Her thighs and ass grew wider and softer, pressing against the base of the tree. Sunnie panted, the pressure inside her building, Cinder’s caresses sending shivers rocketing up and down her spine. She looked frantically around. She couldn’t be seen in public like this, especially not in Canterlot!
“What’s the matter?” Cinder giggled. “Afraid of someone seeing you?”
“Y-oooooh… y-yes…” Sunnie chomped her tongue as her belly bwomped forwards again, squeezing her eyes shut, just barely keeping her composure by the skin of her teeth. It just felt so good! Despite herself, she moaned again, her cheeks so red her freckles were almost hidden. Cinder licked her lips, glowing with excitement as she watched Sunnie slowly balloon outwards, and she planted a warm kiss on Sunnie’s lips.
“C’mon, blimp… my house isn’t that far, and neither is my bed…” Cinder hopped to her hooves, gathering up the remnants of their picnic as Sunnie struggled with her beach-ball tummy. Sunnie gasped and writhed and finally stood. She moaned louder as her belly was squished between all four of her legs, and growing larger and larger with each passing second. She could hear a quiet hissing noise over the grumbles and burbles of her stomach. She bit her lip and waddled forwards to follow Cinder, fighting against her desire with each step.
Cinder skipped happily along, humming to herself as Sunnie laboured to keep up, and to keep her belly from sending her over the edge. Each step was a cascade of pleasure and embarrassment, and Cinder kept saying “not far, tubby!” to every single one of her inquiries about the house. Sunnie felt so full, impossibly bloated and taut, her belly rubbing the ground and still she grew, her face burning red as she was forced to waddle past storefronts, seeing her reflection in the windows, a ballooning blimp of a mare, red as a rose. Cinder wasn’t helping either.
“Do try to keep up, fatty!” Cinder said, playfully poking at Sunnie’s groaning stomach. “At this rate, I’m going to have to roll you home!” With each poke and prod and tease, Sunnie swelled faster, and faster, her rear now wobbling like jelly, her moist thighs squashing her belly more and more, and she gasped with each step, pleasure rolling across her like thunder. Sweat beaded her brow as Sunnie fought with all her might against herself. She just needed to make it into the house. She just needed to stay mobile. She just needed… a hoof pressed deep into her bulging butt, causing an involuntary moan and another small surge of growth. Cinder had stopped in front of her house, and beckoned Sunnie into the door. She waddled in, her hooves barely able to reach the ground past her balloon of a gut.
The door frame squeezed against her, and she felt her belly press against it more and more with each passing second, her back hooves scratching at the ground, her eyes rolling back into her head as she shoved herself forwards, popping through the door like a cork. Cinderheart breathlessly hustled her up the stairs, her own face glowing, eyes alight and dancing with anticipation. Sunnie heaved and huffed her way up the stairs, goaded on by Cinder’s words.
“Looking like a nice stuffed turkey! Not stuffed enough I bet.” Cinder hissed in Sunnie’s ear as they climbed, her hooves pressing deep into the taller mare’s swollen underbelly. “You just looove being bigger, don’t you? Being all big, and bloated, and helpless…”
“A-aaaah!” Something caressed the inside of Sunnie’s quaking thighs, and she almost pitched forwards onto the top step, dragging her body forwards as the first tingles of an orgasm pulsed through her body. She pushed and scooted herself forwards, moaning and gasping, soon she wouldn’t have to contain herself, soon she could let go…
Sunnie flopped onto Cinder’s bed, on her back, knocking a couple plushies to the floor. Her belly rose before her, a round, soft yellow balloon, swelling more even now, feeling so full, so full it couldn’t get any bigger yet it still grew. She barely noticed Cinder climbing on the bed next to her. Cinder licked her lips, before placing her hooves lightly onto Sunnie’s belly and rubbing gentle little circles all over it. Sunnie arched her back, mewling deep in the back of her throat as Cinder pressed in harder, and harder. She shook with pleasure, tongue lolling out, eyes crossing as she edged nearer and nearer to her climax. The pressure inside her was immense, her belly stretching out bigger and bigger as it hissed. Cinder’s horn swirled with magic as she rubbed and rubbed the expanding belly in front of her, feeling as it grew more and more taut, before leaping up onto the big yellow medicine ball.
Golden yellow tendrils of lights brushed Sunnie’s lower belly, working their way lower and lower until reaching her thighs. Sunnie’s breath caught as she felt something drive itself deep inside of her soaked pussy, and she shrieked in ecstasy as she came. A tremendous FWOOOSH filled the room as her belly shunted outwards, creaking audibly, pressure and pleasure mounting together as Cinder’s magic cock drove itself harder and faster into the blimping, moaning mess that Sunnie had become. Her eyes were rolling around in her head, her mouth open, tongue hanging out, gasping and shuddering as a cascade of osgasmic pleasure washed over her. Her belly was exploding in size, groaning up towards the ceiling, growing tighter and tighter underneath Cinder’s hooves. Cinder’s hips bucked against the quaking belly underneath her, her quiet moans drowned out by Sunnie’s shrieks and the ominous creaks of a belly with not much more room to grow.
Sunnie was massive and creaking and climaxing and still growing. The pressure and pleasure mixing inside her was growing too volatile, she was too full, there was too much air inside her, she was going to pop, she didn’t care. She never wanted the feeling to stop, never wanted Cinder to stop fucking her, never wanted to stop swelling even if it meant something disasterous… she felt something in her belly shift, her back arching, and she wailed as another orgasm hit, bloating her further, too much, too full, going to…
POP
Sunnie’s belly button popped out, right underneath Cinder. The unicorn came herself, slamming her hips down onto Sunnie’s new outie. She screamed, her magic cock widening and slamming harder into Sunnie. The two came together, again, and again, and again, each orgasm pushing the other over the edge in a continuous cycle of swollen ecstasy. Cinder finally shrieked one last time, the magic in her horn sputtering out, and she slumped down and off Sunnie’s belly, which by now was nearing the ceiling. Sunnie whimpered and murmured, coming down from the orgasmic high. She was still swelling, very slowly, and her bloated, blubbery thighs rubbed desperately against each other. So far gone, she barely noticed Cinder’s lips against hers, barely hearing the unicorn’s stomach bellow hungrily, barely noticing Cinder’s shaky, predatory grin.
The next thing Sunnie knew, her head was surrounded in something soft, and moist. It was relaxing, in a way, and she closed her eyes, reveling in this new sensation as Cinder used her hooves to push more of Sunnie’s bloated body into her mouth. Slowly, her head disappeared down Cinder’s throat, then her shoulders. Her belly would be the biggest challenge for the little unicorn, but she was determined, and hungry. She squished and crammed and gulped, each second her meal getting bigger and bigger both inside her and out. Finally, with one last herculean gulp, Sunnie’s tail disappeared between Cinder’s lips. She leaned back, huffing a little, rubbing at what little of her belly she could reach, moaning softly as she felt Sunnie grow within her still, feeling her own belly creak as it was forced to swell too. With a belch, Cinder settled down on the bed, using just enough magic to keep Sunnie on the edge, to keep her swelling, and using just a bit more to keep herself on the edge.
Cinder let her eyes drift closed as she and Sunnie grew together, slowly, bellies stretching out wider and wider, feeling so full yet somehow managing to get fuller each passing second.