Rarity and Applejack Explore Inflation.

"Hold still, Jackie. You don't want mascara on your eye, trust me."

Applejack snorted just loud enough to voice her displeasure, but quickly obeyed, freezing in place so the unicorn could work her magic.

"Rarity, I ain't never had a use for fancy makeup. I think ponies should be pleased enough with their looks they're born with."

"Yes, dear, I know you prefer the 'au natural' look, but you must admit, there's something pleasing about a pony who looks her very best."

Applejack scratched the floor as a blush graced her freckled cheeks. "Well, ya know... T'was kinda nice hearing all them compliments on the way to the farm when I was 'Applejewel'."

Rarity batted her hair and fluttered her eyes. "I smell like rosebuds!" the unicorn said in a mocking tone.

"Har har. That part I wasn't so keen on. The less I remember of that, the better," Applejack said, lowering her hat over her face. A sudden knock caused both mares to look at the door.

"Are we expecting company tonight, Rares?" Applejack asked, looking at the moon through the window.

"Not that I know of. I wonder who it could be," Rarity said, walking to the door. As soon as she turned the knob it flew out of her hooves, slamming open.

"GREETINGS FAIR RARITY AND APPLEJACK! WE WOULD LIKE TO BE INFLATED FOR PLEASURE!"

Shaking off the initial shock, Rarity picked up Luna by her barrel, slammed the door, and placed the princess of the night on the floor. Clearing her throat, Rarity finally opened her mouth to speak.

"Well hello there, Princess Luna. It's nice to see you too. Is there any reason you wish to announce our sexual deviances to the entire town?!"

Luna blushed. "I apologize, fair Rarity. I was simply nervous. I often times fall into the old tongue when my nerves get the better of me."

"Eh, it's quite alright princess... but uhh, how exactly do you know about our secret anyway?" Applejack asked.

Luna strolled between the lovers, her head held high and eyes closed in a dignified manner. "My domain is the dream world. I am privy to information other ponies could only dream of obtaining. The number of dreams you two have had where one of you has been inflated like a balloon have skyrocketed since you two have become a couple."

"Guess we can't choose our dreams, ya know," Applejack said, scratching the back of her neck.

"I suppose that makes sense," Rarity reasoned. "So what exactly made you want to try such a ridiculous idea anyway?"

"You and Applejack seemed to be having a great deal of fun and pleasure. I simply would like to experience this for myself."

"Riiiight. Ya see, Your Highness, most ponies consider things like that private. They don't exactly go lettin other ponies in their bed and all," Applejack explained.

Luna's face fell in disappointment. "Oh... I see. I suppose things are quite different between now and long ago when I looked over the night. I apologize for intruding upon your personal life." Luna turned and walked to the door, her head hanging low.

Rarity glared at Applejack.

"Ugh, fer pony's sake. Alright, c'mon back. We'll do it," Applejack relented.

Luna spun around, her smile coming back in an instant. "You won't be disappointed! Whatever must I do?"

Rarity stepped forward to the alicorn and gently prodded her soft supple side. "Hmmm. What do you think, Jackie? A little water? The air compressor?"

Applejack gave Luna's belly a light prod. "Nah. I think a fancy pant pony like her should get a bit gassy."

Rarity gave a devilish smile and walked to the kitchen. Applejack put a hoof around the alicorn and led her to the hallway. "C'mon, Princess. We need a bit of room."

Luna followed the cowpony with a nervous twinge until they reached a door at the end of the hall. Applejack pushed it open and led the alicorn inside. The walls were painted a light shade of pink. There was only one window and it was frosted for privacy. In the middle of the room was a drain, which the entire floor slightly slanted towards.

"What purpose does this room serve? It's quite large." Luna said.

"We built this for our uhhh, activities," Rarity said, walking up to them with a small tube. "We got a bit carried away one day with poor Fluttershy and found the limits of our bedroom."

Applejack took the tube and offered it to Luna. "Here ya go, Princess. We'll take it kind of slow for your first time. This should only get ya around eight feet."

Luna took the tube and inspected it carefully. Inside was a brown runny liquid. "It surely doesn't look appetizing."

"I baked it into a pie once. It tastes alright. Now go on then. Down the hatch," Applejack said.

Luna tipped the tube back and drank the liquid in one gulp. "Oh my! It tastes like liquid marshmallows! What a delightful potion!"

"The fun hasn't started yet darling," Rarity said, rubbing Luna's slim belly. She led the alicorn into the middle of the room and sat down on the ground, motioning for the alicorn to lie against her. "Come, I want to feel you grow."

The alicorn blushed but did as she asked. Rarity's svelte stomach made a rather disappointing cushion.

"Jackie, dear, if you please?" Rarity asked, holding her mouth open. The cowpony walked over, took a deep breath, put her lips to Rarity's and exhaled carefully. The unicorn moaned as her belly puffed up underneath the alicorn. Applejack did this twice more until Rarity's paunch had grown to mid-term pregnancy sized. Their lips parted slowly and Rarity smiled. "Thanks, Jackie. I wanted her to have a decent pillow."

Applejack smiled and took a step back. Luna reached behind her back and gently prodded Rarity's bulging stomach eliciting a pleasured moan from the unicorn. "I hope my turn is soon."

On cue, a rumble sounded in Luna's belly. Then another, and another. Slowly, Luna's belly started to rise in front of her. "Oh... oh my!" She squeaked out. Her gut became a sea of roiling noise as her insides tossed and turned. Reaching out to her belly which had now reached the size of a beach ball, Luna gave it a squeeze causing a small pop to be heard.

Applejack snickered at Luna. "Looks like your belly button just went to an outie there princess."

"Is that bad? It feels really good," the princess moaned out.

Rarity groped Luna's belly as it extended outwards another foot. "Jackie, isn't there something wrong here?"

Applejack thought for a moment. "Yeah. She's supposed to be making some mighty rude noises right about now."

Luna's belly hadn't gotten the memo it seemed. The alicorn rubbed her swelling belly now six foot wide and growing. "Goddesses! There's so much pressure! It feels quite good!" Reaching around her dome like belly, Luna started pleasuring herself with her hoof which was soon covered with natural juices dripping from her honeypot.

"I can't help but notice she's not slowing down," Rarity pointed out.

"But that's less than I gave you! She should be slowing down! Oh... buck."

"What is it, Jackie."

"Luna's an alicorn! They don't make gas like us! They make helium, and lots of it just like pegasi! They don't expel it very easily neither!" Applejack explained.

"We demand you two stop squawking and service your princess!" Luna said. Her belly had reached such a size that her entire body started rounding out. Now more than ten feet in diameter, Luna had become a giant helium filled balloon. Her bloated legs stuck out from her nearly spherical body forcing them apart.

"So you're saying we have to force the gas out somehow? Rarity asked.

Applejack thought carefully back to her previous conversations with Rainbow Dash. "Rainbow said it had somethin to do with breathing!"

Rarity walked around to Luna's rear. Nestled between the great swelling expanse that was her royal rump was her puffy marehood, dripping with need. "I think I know a way to make her let it out."

Slowly, Rarity dragged her tongue across Luna's swollen pussy lips. She was rewarded with a drip of nectar. "Looks like balloona here is enjoying herself."

"Don't... do not call me that," Luna said. "Please your princess at once!"

Rarity tsked. "You're not a princess anymore. You're a balloon. Our balloon. You give us pleasure now," the unicorn said as she slowly licked Luna's honeypot again.

"But I-"

Applejack put a hoof on Luna's pouty lips. "That's funny. I don't recall balloons being able to argue. Maybe if you're good we'll take care of you. Alright?"

Luna nodded slowly.

"Balloona here is being good now, Rarity. You can give her the reward."

Rarity eyed her prize carefully. Giving herself a quick feel, she too realized she was wet down below. Luna's massive spherical form continued growing higher without end and finally she started lifting from the ground. "Oh dear Applejack. Balloona here looks like she's starting to float. Maybe we should get some string."

"Not necessary." Applejack walked over to Luna's face and put a hoof on the alicorn's head. "I've got an idea. You be a good balloon and put your mouth right here," she said, tapping her dripping marehood, "and you do your royal voice thing."

Luna nodded and watched as Applejack lowered her crotch until Luna's muzzle penetrated it.

"Now blow you big fat blimp."

Luna tightened her diaphragm and exhaled like she had been taught so many years ago. Applejack's belly exploded outwards causing her to shudder. "Y,yeah! Keep going... just like that!" The cowpony said, rubbing her rapidly expanding belly.

Rarity admired Luna's ballooning form, still growing despite the air she was pumping into lover. Grasping the living balloon carefully, she jumped forward and placed front hooves on Luna's expanding body. Once stable, she started grinding her marehood against Luna's pumped up pussy lips.

"Ohhhh... oh my. That feels simply divine," Rarity gasped. Reaching around she slapped Luna's bloating backside with her hoof and was rewarded with a light airy hollow sound. Much like a party balloon, Luna's skin gave and squeaked in all the right ways.

Meanwhile, Applejack grasped her four foot round belly, giving it a pleasurable squeeze. "Yeah, sugarcube. Give it to me. Fill me up."

With every pleasured thrust Rarity gave, Applejack received a fresh burst of helium to bloat her further.

"More... more!" Applejack panted.

Rarity's thrusts became wild and she lost all rhythm. Pounding on Luna's blimped body and grinding against Luna's pussy, she finally cried out in orgasm as Luna let loose, spraying her crotch with squirt after squirt of fluid.

Applejack was approaching her own cliff when she saw Luna's body quake and contract. Looking down at Luna's face, she saw the alicorn's eyes close with pressure as her cheeks bulged.

"No Luna! Not yet! Hold on a moment!" Applejack pleaded as she tried to pull the mare's muzzle out of her wet honeypot. It was too late. The first burst hit Applejack, immediately filling and bloating her womb further. Her hooves pulled apart as the swelling belly beneath them exploded outwards about six feet. Applejack gasped and grunted as burst after burst of helium blimped her body. In just a matter of moments, the cowpony soon rivaled the ballooned princess' size and quickly surpassed it.

"G, give it all to me!" Applejack cried out in orgasmic bliss. Her nectar dribbled down Luna's mouth as she bucked and jolted in sexual fury.

Luna's rounded body started shrinking inch by inch as Applejack bloated further outwards. The cowpony wobbled her hooves uselessly as they were now mere stumps sticking out of her massively filled helium body.

Luna finally had reached a size small enough to move her hooves once more. She groped her deflating belly, almost disappointed that her time was up. Once she could move freely again, she put her hooves against Applejack's spherical body and pushed, freeing her muzzle from the cowpony's dripping marehood. She quickly gulped down a breath of air to stop any more from escaping her lips. Rubbing her hooves all over her four foot round belly, Luna moaned out in sensual pleasure. "That was... incredible." She felt another pair of hooves wrap around her neck and prod her soft belly.

"It's incredible every time. I'm glad we could share it with you," Rarity said.

The princess turned around with a sharp look in her eye. "If you ever call me 'balloona' again, I will use you as a hot air balloon."

Rarity giggled and stroked Luna's chest gently. "Don't make promises you can't keep, darling." Rarity's smile vanished when she felt something bump her head. "It appears Applejack will be rather disposed of until she stops floating," Rarity said, giving her bloated lover a playful shove.

The cowpony moaned in agreement as her body bounced gently against the roof.

"You know, Princess Luna, I bet Applejack and Rainbow Dash would make a cute pair of balloons. You wouldn't happen to have any ideas, would you?"

The alicorn thought for a moment. They're very competitive, are they not?"

Rarity nodded, the pair's relentless contests fresh on her mind.

"Then I may know a way..."