Starlight's Inflatable Princess

by Zubric

Rating: mature
Tags: Sex, Twilight Sparkle, Slice of Life, My Little Pony: Friendship is Magic, Trixie, Fetish, Starlight Glimmer, Random
Length: 3864

Starlight gets rather mischievous one day and uses a inflatable spell on Twilight.

Given the number of spells Starlight knows, it was only a matter of time before she had a rather mischievous idea. Twilight is about to have a very squeaky experience.

Sex tag due to body alterations and such. But not a sex doll

Cover art by skitterpone

Published 2019-07-31 16:20:01 UTC
Last updated 2019-07-31 16:20:01 UTC

Feeling a little light headed?

It was a warm summer afternoon as Starlight walked alongside Twilight making their way to the lake near the School of Friendship. The two had luckily found free time to just relax and hang out. However, Starlight had an ulterior motive for their little jaunt having found a particular spell to try out. “It’s a pretty nice day, isn’t it?” Starlight asked while double-checking her plan in her head unable to hold back her smile.

“Yeah, it’s the perfect day for reading outdoors.,” Twilight replied, her small saddle bag slumped over her back with only a book or two inside.

Starlight rolled her eyes peering out at the shimmering lake as they approach. “Aren’t you worried the books will get wet? Or you know, you could swim some. I did bring this beach ball for a reason.” Starlight said, while deflated ball sat upon her back being a mere cover for her scheme.

“Oh, I just use the same enchant on them that I use when I read while taking baths,” Twilight replied nonchalantly, watching a few birds fly overhead.

“Why not just do what regular ponies do and not read in the tub?” Starlight asked, hiding her smirk behind her tease.

The princess began to blush sheepishly. “I just get really into a book sometimes. Just never want to put it down.”

“Riiight,” Starlight replied, rolling her eyes. Just as they reached the beach area, they easily spot the lounge chair left folded out along with an umbrella. It must have been one of Rainbow’s for when she would do her ‘Chillax’ sessions. Taking a deep breath, she smiled. ”I can’t wait to try out this new spell.” Sliding the ball onto the sand, watching as Twilight set her saddlebag next to the lounge chair and stretch.

“Oh right, that self-inflation spell. A variation of the come to life spell.” The princess remarked, looking at the ball in anticipation. A moment went by before she heard the familiar hum of Starlight’s magic. However, instead of the ball glowing, Twilight found herself starting to float off the ground. She gasped looking down at herself seeing that her body was now being held in Starlight’s magic aura. “Starlight, what are you doing?”

“Relax Twilight, I know what I’m doing,” Starlight replied, a smirk plastered upon her muzzle.

A shiver ran down Twilight’s neck getting a bad feeling about this. The last time she had been held in her magic and with such a look upon Starlight’s face hadn’t been the most pleasant experience with her cutie mark and her friends being forcibly removed. So, despite what her friend had said, she couldn’t stay calm at all. “Starlight put me down!” A feeling of several pinpricks ran down her spine and along her hooves causing her to twitch and try to struggle. Upon Starlight failing to answer her demand, the princess went to light her own horn on instinct only to feel rather dizzy as her horn failed to even spark. “Starlight!” She knew something wasn’t right especially when her mouth was forced shut by the aura. “Mmmph!”

Starlight just kept on smiling as her horn glowed just a tad brighter. “Shh you’ll scare the fish,” she teased, watching the spell unfold.

Twilight’s panic grew as she wormed as much as she could manage in the grasp as she felt several spots over her body getting colder and expand. The sensation run up her hind legs while another patch grew under her wings. Her horn and forehead became oddly bouncy as well. With a grunt, the princess managed to turn her head to know what was going on only for her eyes to go wide upon finding out.

Spreading up her hind legs was a shiny plastic film with seams on either side. “Mmph!” Looking back at Starlight, she gulped seeing Starlight's grin grow. The plastic swarmed faster-moving past her hips and flowed over her flanks and tail. She kept muffling as the transformation flowed up her wings forcing them to open widely spread. No matter how she tried, she couldn’t close them, and the tingling intensified as her feathery appendages ballooned out bouncing with every twitch Twilight managed. The film washed over the rest of her flanks quickly squeezing them causing her to blush. Moments later she felt a pop sensation on her right flank able to feel what it was. “A valve! No, no stop!” She thought, finding it harder to move with every second that went by her lower half feeling cold and unresponsive.

Starlight’s grin grew as wide as it could be concentrating on the spell seeing the rubber narrow the hips some. As unintentional as it was, it was very amusing to the unicorns watching. "Hmm, this is coming out pretty well.”

Twilight muffled as loud as she could through Starlight’s magic as the transformation washed over her barrel and up her neck. Her voice vanished as her insides became nothing but air, while at the same time she could feel every part of her bouncing. As the magic consumed her head, she could feel her muzzle contorting transfixing into a wide goofy grin before fusing into solid plastic leaving her smiling like an idiot. Her eyes soon followed as they were soon pulled open into a welcoming happy expression of fun much as you would see on any pool toy. With the transformation complete, she could do nothing but watch as Starlight set her down and laugh.

“Oh, you should see the look on your face right now,” Starlight snickered, squeezing the rubbery cheeks. She watches the sunshine off the plastic poking the wings. “I wonder what kind of book you bought.” Moving to the saddlebag, she pulled out the book Twilight had been talking about smiling. “Ooh, Doctor Cosmos? I never knew you were a sci-fi fan.” The pool toy, of course, didn’t respond simply swaying slightly from a breeze. Letting out another chuckle, the toy was brought to the water. Starlight grinned. “Now for the real test.”

Twilight mentally shivered the whole time feeling every breeze and touch on her smooth air-filled skin. “Change me back!” she yelled, knowing full well she had no voice. It wasn’t long until she felt the cool water lap at her hooves and air pushing to keep her afloat as more of her body was submerged. When the water touched her barrel, she felt Starlight push her out into the deeper water. Unable to turn her head she heard Starlight giggle once more. “Let’s see how you float with a passenger.” Before she could think of what she had meant, she felt pressure as the mare climbed on top of her making her bob more. If Twilight could blush, she would have the sensation oddly stimulating. Starlight hind hooves soon rested on Twilight’s flanks as she lay on her back using the wings as support to stay on board without tipping.

Starlight leaned her head upon the pool toy’s inflated mane and sighed. “Ah, how comfy.” Each shift caused squeaks from the plastic as the unicorn cracked open the book. “Let’s see what this story has to offer.”

Twilight groaned internally as she watched the shore occasionally feeling Starlight’s hoof kick into her flank making her bounce in the water. An hour goes by the princess feeling bored without any way of moving. The air inside her shell was getting cold too causing her body to squeeze a little. “Starlight is so going to get it once I'm back to normal!” Her body bobbed wildly when Starlight slid off her back and began to pull her to the shore. As her rubbery form left the water's embrace, she felt an odd tingle run down her spine as if feeling a sense of wanting to return. “N-no focus, Twilight.” The sand brushed against her rounded hooves as she was set upon the small beach hearing Starlight speak moments later.

“Well, I can’t carry you back to the castle like this,” Starlight said with a smirk. “Good thing I can do this.” The unicorn's hoof slid across Twilight’s back soon touching the flanks. She gave it a small squeeze before touching the valve popping it open.

Twilight felt violated by being touched on the butt before feeling the air rushing out of her flank. Her head swam as the pressure dropped inside her making her feel as if she was slouching. It wasn’t long until Starlight laid the toy on its side hooves pushing harder on the plastic shell to force air out much faster. The toy princess began to feel dizzy as her form became thinner and thinner and her skin beginning to wrinkle. Soon both halves of her body were touching each other, and her vision became a little fuzzy. Starlight’s hoof pressed down upon Twilight’s head pushing out any last pockets of air. the alicorn became disoriented as the toy’s limbs were folded up Twilight's muzzle soon touching her flank giving them an involuntary kiss. Each proceeding fold hid her vision in darkness as she was pushed deeper inside herself. “N-no stop it!” Twilight mentally panicked, even as she felt her now square form being tucked into the saddlebag. Thoughts of being stuffed into a closet made her shiver. A forgotten toy was never a good thing. “No, I'm not a toy!” Twilight reminded herself unable to see as Starlight slipped the saddlebag on her back and headed up the path leaving no evidence.

Starlight grinned making her way back up the path with a light skip. She had to admit, she’d rather enjoyed using that spell on Twilight and deflating her had been a good way to release stress. However, her experiment wasn’t done just yet a few ideas bouncing around in her head. That, and with Trixie visiting, she was sure her friend would get amusement out of this too. She knew full well Twilight would be quite peeved at what she was going to do, but she’d take the punishment knowing it would be worth it. Plus, she’d make sure to hide the pictures. A little blackmail never hurt.

Luckily for the Starlight, Spike was busy at the school leaving her to enter the castle without issue. Staring back at the saddlebag, she smirked mischievously patting the bag a few times. “Hehe, Twilight you sure are in for some fun.” With her laughter subsided, she made her way up the stairs and into her room. “Just wait till Trixie sees you.”

Twilight the entire time had felt light-headed her mind unable to focus with even panic being strained. Each bump and shift pressed her body into itself reminding her of her empty shell. Upon hearing Starlight’s enthusiasm, her nonexistent heart skipping a beat. “No Trixie can’t see me lie this either. Who knows what she’ll do to me like this!” While she was worrying, the princess hadn’t heard Starlight exit the room leaving Twilight all tucked inside the bag. The next few minutes of silence went by in agony Twilight unable to do anything but lay there. To pass the time, the toy made a checklist of all the things she’d make Starlight do as punishment. “First I’ll make her wear a maid outfit, then do all of Spike’s chores. Let’s see her face when she had to clean the toilets. Scratch that, clean the whole school. ”Her anger continued to bubble as she heard footsteps approaching along with the sound of a very distinct voice.

“Hahaha, you really did that?” Trixie asked, sounding like she was trying not to laugh so loud. “Trixie is just jealous she didn’t think of that first.”

The door was opened as the two mares entered. Starlight smiled. “Yes, let me just get her out.”

Twilight felt an oddly pleasurable sensation run along her body as Starlight reached inside to pick her out. Was she a good toy? She mentally shook her head once more feeling the hooves squeeze all over her and the stretching feeling as she was unfolded allowed to dangle limply in front of them. Her vision was rather strained given how flat she was, but she could easily see the snickering smile on Trixie’s face.

Starlight’s smile grew as she wiggled the toy around a bit. “Well better get her inflated,” she said, laying the princess upon the bed. Instead of using her magic to force air inside the toy, however, Starlight had a very devious idea knowing full well what it might feel like. Reaching towards the purple flank, her lips pressed on the valve and began to blow.

An oddly pleasant sensation ran through her body upon feeling the warm air pushed into her frame. The close contact made her mental side blush as each breath made her grunt her side spreading and inflating. The slow build-up that Twilight felt could almost be described as arousing with her mind feeling disjointed.

Trixie snickered behind a hoof as the toy kept filling with air. “Oh, I knew you kissed Twilight’s flank, but I never knew it was that literal,” she said with a heavy snark. Seeing the blush come over Starlight's cheeks was just the icing on the cake. The inflation continued onward Trixie watching the head bloat up and that silly big grin staring at her.

Starlight panted once she had filled Twilight with enough air pushing the valve closed. “Phew, and here I thought Rainbow Dash could be an airhead.” Giving the rump a solid thump, she watched the toy jiggle around.

Trixie still amused strutted over and lightly slapped Twilight’s big muzzle. “Ha take that.” She looked towards her friend while poking the toy some more. “So, what other plans did you have for her? What kind of toy is she?” She asked, smirking some.

Starlight blushed. “Uh, what do you mean? She’s a pool toy.”

Trixie hoof moved along the wings working its way down to the tail. “Oh, Trixie was just wondering if it was anatomically correct.”

Twilight squeaked at every touch and slap and while it didn’t hurt, those pleasurable sensations permeated throughout her plastic form. Even as Trixie's hoof violated under her tail, she felt the tingle. “Eeep, no stop that!” She silently protested, even as relief came over her when she could feel the hoof touch nothing but a long seam that ran between her legs and up her barrel.

Starlight kept watching Trixie rub blushing. “T-Trixie stop that.”

“You aren’t stopping Trixie from doing it,” Trixie snarked back. “What other experiments were you planning to do to her?” she asked, pulling her hoof away. “Can you alter her shape?”

Twilight squeaked at Trixie’s rather violating touch. feeling the hoof feel her seams. Her absent heart skipped a beat as what was said next. “No way! Don’t do anything!”

Starlight cheeks reddened as thoughts drifted into her mind. “I mean, I had thought of using the come to life spell and see how well her movement is in such a form.”

Trixie booped the rubbery princess once more as she scoffed. “How about making her look like Trixie? Or one of those show mares in Los Pegasus.”

Starlight blinked taking in what Trixie had just said before laughing. “Oh, is somepony jealous of Twilight’s figure? That would explain why you touched her.” She teased, poking Trixie’s side.

“Trixie is not jealous!” Trixie protested watching as Starlight turned her attention to the blow-up princess.

“Hehe, oh let’s see how you’d look then,” Starlight sneered focusing her magic and making the balloon’s body glow.

Twilight mentally squeaked her locked eyes able to catch the sight of her latex body surrounded in Starlight's aura while colour began to expand out on the top of her nose. The blue rubber flowed over her muzzle squeezing and making more painted on plump lips. Her mane had also changed to silver stretching in length as her form creaked as it changed. The physical changes, however, didn’t start until it got further down when the transformation passed over her barrel. The plastic creaked once again as her waistline was unnaturally compressed while her hips ballooned outwards as a result. The princess was unable to see Trixie’s blush as the magician stared at the two tennis ball shapes expanding where the breasts would be. Finally, her tail changed from her multi-coloured hue to the fine silver. Twilight felt humiliated inside as she saw how she now looked in the mirror. “You are so dead when I get changed back! Hopefully not like this.” A worrying thought of what could become of her if she was changed back in this form. Would it be permanent? She hoped not.

Starlight meanwhile eyed her creation giving Trixie a sly grin. “See, you came out great.” She mocked smacking the flank of the pool toy watching as it jiggled.

Trixie’s cheeks couldn’t get any redder if she tried as she shook her head. “Okay, you made your point, change her back.” Trixie squeaked diverting her eyes out of pure embarrassment.

Starlight moved back over next to Trixie taking a minute to get over her laughing fit. The look upon Trixie’s face was just too priceless. Her horn alit with her magic casting a spell over the inflatable princess. To Twilight’s relief, she felt her form start to warp back to normal her native colours returning. Unfortunately, it seems Starlight wasn’t quite done messing with her as her hips remained plump.

Trixie tilted her head looking back at her friend. “So, what else did you plan to do with her?”

“Oh, just one more spell to try on her.” Starlight replied, washing her magic over the princess making its surface sparkle.

Twilight instantly felt a wave of vertigo came over her while her body swayed forward. To her surprise, her left foreleg reached out to stop her fall. Now realizing that she could move, she lifted her hoof to her face and pressing it into her rubbery cheeks.

“It's the come to life spell,” Starlight explained, “I just tweaked it a bit.” She watched as Twilight took a moment to look herself over before running towards her. On reflex, she put her hooves up feeling the alicorn plow into them with little resistance. The air sack that was the princess was bounced back gently falling onto her back. Starlight couldn’t help but laugh. “What a mischievous toy.”

Twilight mentally scowled and would be giving Starlight the death glare that is if her eyes weren’t locked wide open. Her body squeaked as she got back to her hooves and pointed at the two being about the only emotion she could convey. "I am not a toy!"

“Trixie thinks the princess wants to be turned back, but I don’t think she can really make demands right now. “Trixie teased being amused when Twilight’s hooves stomped on the floor jiggling the wings on her back. “So, what now?”

Starlight grinned as the princess tried to charge once again. “Bow to me,“ she commanded.

The princess froze in mid charge feeling her body tingle as she obeyed her mistress's command bending her knee and lowering her head to the floor in front of Starlight. No matter how she willed herself to move, her form remained in the submissive pose. “Augh a compulsion spell. Starlight you are so getting it now.” She thought even as the other two mares talked.

“Good, now passionately kiss Trixie. “Starlight commanded with a giggle.

“What?” Trixie said moments before the goofy fixed grin was rubbing onto her lips. The mare tried to pull away only for Twilight's hooves to wrap around her head smooshing Trixie’s face into the rubber.

As Starlight listens to Trixie’s muffled protests she stared at her kite lying next to her bed having one final idea. “Hehe, okay you can stop. “

Twilight was quick to pull back once the impulse was lifted scamping back as Trixie blushed and glared. “Gah, what was that for?”

“Because it was funny. “Starlight replied using her magic on Twilight locking the form into place once more. “I think I want to try a new balloon.”

“What? No not like this!” Twilight panicked even as she felt the gas Inside her change. As strings were tied to each of her limbs, it became just a bit harder to focus as her body was pulled along and into the sunlight once more. The two mares chatted amongst themselves steadily letting their balloon rise higher and higher the toy easily able to make out her school nearby. “Sh-she is So counting grains of sands without magic!” She thought, even as she suede in the wind. Mere minutes later one of her students noticed her moving over to Starlight out of curiosity.

“Hey counsellor Starlight, cool balloon you got there. “Gallus remarked, staring upwards at the princess. “I didn’t know they made ones of the princesses. “

Starlight held back a snicker as she smiled giving an innocent look. “This one is a custom order. it's quite magical.“

An hour passed as Twilight remained Starlight’s plaything bobbing up near the clouds while the two mares hung out. After getting bored, Starlight began reeling the princess down. A moment of relief of this treatment possibly being over washed over Twilight, only to be dashed as she carried along to the School of Friendship. “Where is she taking me now. Change me back already!” Much to her further embarrassment, she was helpless to watch as Starlight tied the lead to the lobby’s fountain letting her act as a centerpiece. Starlight grinned ear to ear as she winked at the pool toy before wandering off.

Twilight felt time go by slowly as she could still hear the clock tick on by unable to do much else but thinking of various things. One such thought was one how this spell inflicting her could be used in other ways just so she’d have something to use on Starlight later. She so desperately wanted to call out to the students that would pass her by occasionally glancing at her form before moving along to their next classes. As the day drew to a close, Twilight’s hopes once more rose seeing Spike walking alongside Starlight as they move to the door pausing to look right at her.

“Hey, speaking of Twilight, have you seen her? I have some papers she needs to look over.” Spike asked finding the wide grin on the inflatable funny.

Starlight shrugged. “Oh, she said she had to go to Canterlot in a hurry for something important. She said she’d be back on Monday.”

Spike blinked looking confused for a moment before nodding seeming convinced. “Oh okay, not sure why she didn’t tell me first,” Spike replied idly heading out with a gentle whistle.

Even as Starlight grinned at Twilight, the toy panicked. “Monday, you can’t leave me like this all weekend.” As if reading her thoughts, Starlight gave a mischievous wink before leaving the light turning off. The princess swore she heard faint laughter as the room became silent.

Twilight mentally screamed.

Author's Note

It's not perfect but I hope you all liked it at least.