//------------------------------//
// CHAPTER FOUR 
// Story: Locked in 
// by Gassipons 
//------------------------------//


"Wh-what!?" Rarity gasped in shock.

"It's essential, I assure you."

The next test Rarity had to pass involved acting as a cushion to Rainbow Dash, and being willingly face farted by her friend.

"These tests seem awfully arbitrary, Rainbow Dash."

"Look, I'm gonna let you in on a little secret here." Rainbow Dash sighed, sitting up straight and facing her friend.

"Wh-what?"

"I've done this before with somepony else; somepony else who wanted to fart a little more often too."

"R-really? Who?"

"Fluttershy."

Rarity gasped. "Fluttershy!? S-surely not!"

"Yep. I was having a slumber party at hers, breaking out the sick farts as usual, and she suddenly opened up to me and told me how she wished she could fart like me; she idolised me, apparently.
Well, I agreed, of course, and I went through my little tests like I'm doing with you. Now, it took her a little while to even build up the courage to fart in front of me, but eventually she did. Let me tell you.." At this point Rainbow Dash's faced wrinkled up a little in disgust, despite the lack of any fart gas in the room.

"Now your farts are bad, and when I train up for flatcomp my farts are awful, but both combined are nothing on Fluttershy. Her farts are... An experience. Honestly, after she let rip in her bedroom we had to evacuate the cottage before I passed out. I... I think a potted plant in there physically withered and died in seconds. It was like a fumigation!"

Rarity's eyes widened even more. "Oh, gosh."

"So we have to finish the test out in her garden, and slowly she began to open up... In more ways that one... I think I'm the closest anypony's ever been to Fluttershy's gas and lived. B-but anyway, you know how I said there were only a couple other mares at flatcomp?"

"Y-yes?"

"Well, after she passed my training, Fluttershy was one of them. I told her it was best to abstain from the smell round just because I feared for the other contestant's lives.. She's second in volume to me, though; that pony is a natural pro when it comes to farting."

"I never would've guessed." Rarity muttered.

"She's still kinda secretive about it, she said she refuses to fart in front of us guys in case we decide to stop being her friends. D-don't tell her I told you this, ok?"

Rarity nodded, a little reassured and still surprised.

"W-Well, I suppose I should really go ahead with the next test, then." Without any more arguing, Rarity laid on her back with her muzzle sticking up in the air.

"Ok; get it over with."

Rainbow grinned and chuckled, plodding over to Rarity as she turned and lifted her tail, her slightly sweating and plump rump bearing over her friend as it lowered slowly and rested over Rarity's snout with a light thump.

Rarity held back a gag as she could feel Rainbow Dash's body rumble over her, the gas groaning slowly towards her until a sudden "Braaaaap" rushed out and up her nostrils, the sultry stench of eggs all she could experience. She screamed a little, shuffling around but unable to wriggle free.

"Don't fight it, just sniff."

Rarity gagged loudly, cautiously taking little sniffs of the absolutely foul gas and shivering in disgust.
Rainbow popped out another couple of wet bubbles of gas, followed by a couple more and then another couple.

"Sniff deeply. Right into the bottom of your lungs."

Rarity sobbed quietly; she didn't want to, but she knew she had to.
Slowly she began to take a deep breath of the rotten fumes, a loud gag interrupting her attempts.

"I can't! I can't do it! I'm going to throw up; please get off!"

"That's natural. The gagging will come at first. I'm not getting off you until you can take at least ten deep breaths of this with no retching at all."

Rarity began sobbing a little louder.

"PLEASE, Rainbow Dash. It's disgusting. I really can't take any more."

"Yes you can. Just keep breathing it in. Deeply. Savour the gas on your tastebuds as you do so. Take it in like a rich, creamy toke of a pipe."

Rarity attempted to breathe in deeply again, getting a little further in her efforts but gagging and failing once more.

"I just can't do that, Rainbow Dash. I'm honestly going to throw up in a minute."

"Then throw up. I'm not getting off until you can do it. Here, have a refill."

Rainbow pumped out another juicy fart, Rarity screaming loudly and gagging again in response to it.

She tried taking a deep breath again, and at last she found herself able to do so. She went to take a second breath but was stopped immediately by a particularly wet gag.

"This is disgusting. This is absolutely disgusting."

Rainbow Dash simply didn't respond, keeping Rarity trapped until she was able to do as she'd asked.

Rarity took a deep breath again, and stifled a gag. She took another, and then managed to take another. Her lungs ached with the putrid gas she was filling them with, but she knew she had to carry on. 

Six breaths.. Seven breaths.. As Rarity was inhaling an eight time Rainbow ripped a deep, squelchy fart down her throat with a loud sound like a frog. Rarity shook as she held back the strong urge to gag, taking the full breath in and then finally two more. Her lungs felt like she'd just inhaled a large amount of poisonous fumes, which in a sense she had.

"Ok! Ten! I d-did it! Please, please just get off me now!"

"Nah. One last thing." 

Rarity was speechless. "Wh- Y- You said you'd get off!"

"I lied, but after this I will. I promise."

"Wh-what do I have to do now!?"

"It's simple. You just pucker your lips up, like you're about to kiss somepony, and you purse them over my butthole. The first time I fart you swallow it down to your stomach; get a good taste. The second time, I want you to breathe it in and hold your breath for about... Ten seconds."

"No way! That's just absolutely repulsive; even a pig wouldn't do something so vile."

"You have to."

Rarity went to protest, but realised it would change nothing. She sighed, and puckered her lips up, leaning forwards and pushing between Rainbow's two buttocks, feeling her lips press against something leathery and toroidal. She shivered.

"Ugh.. I'm still pretty full of gas, so expect these to be long.. Expect them to be nice and juicy, too~ Heh~" Rainbow Dash chuckled and focused her energy on her bowels, pushing gas down to her butthole.

Within a few seconds a wet ripping trailed from Dashie's asshole, the sound tinny and hollow as it released directly into Rarity's mouth. As instructed, she began to swallow the thick gas, feeling her stomach reel as the bitter and vaguely eggy taste plastered her mouth. She continued to gulp down the fumes for the whole seven seconds it was released, her belly growling in disagreement.

"Ahh.. Ok, now here comes the second fart."

As she felt it rush out, Rarity huffed in the noxious pollution until her lungs reached full capacity and held her breath, counting ten seconds before breathing out again slowly.

Once Rainbow had heard her exhale and woozily pronounce "done." She finally got off of her unicorn friend, leaving Rarity to slump over sideways and cough.

"Th-that was vile. Absolutely vile. All I can taste is.. EUrgh.. Methane." 

"Excellent."

"May I ask why exactly that was necessary? Did you just want to see me suffer, because if so you have succeeded."

"Well, this is gonna sound harsh, but I just effectively traumatised you. It's all smarty science stuff; basically now your brain registers that event, and my farts, as significant. You will eventually start having a more positive approach to farts in general, if that worked out like it should have done."

Rarity looked over. "That's just cruel. I think I have more gas than oxygen in my lungs now."

"Well, the next stage might be more to your liking."

"What's the next stage?"

"This time you'll be using my face a cushion." Rainbow smirked.