Every breath was painful for you. The longer Kelsi held in her farts, the harder it was to breathe. You didn't ever think you'd end up like this: trapped inside your friend's ass, left to rot in her filth as she suffocated you with a fart. Yet, here you were. You couldn't see anything in the gurgling darkness of the girl, but her sticky anal walls were all around you. The giant muscles were tense, straining to hold in the monstrous load of gas from her past meals. She was keeping her ass closed tight, unaware that you were trapped inside, wallowing in misery in a fleshy ditch that was filled with slime.

Your chest started to ache. It was like needles were poking through your ribs and into your lungs. Your head felt dizzy. It was clear your body wasn't getting the oxygen it needed, humans weren't supposed to survive under these kinds of conditions. Kelsi's thick bubble of farts was so strong that it was making her anal walls bulge out, uncomfortably. The tainted air was heavy with decay, a scent your body had almost become used to out of shock. As time crawled on things only became worse for you. More farts would join the enormous bubble, adding to the density of the air. You started to realize why it was becoming so hard to breathe. The immense pressure of her gas was smothering you, at your size the girl's farts were so tight that your lungs could barely push them back out!

That made you panic, which didn't help your breathing any. If this kept on your would die in your friend's ass! Your hot friend's hot ass, but it was still pathetic all the same.

----

"Ugh... I REALLY need to fart..." Kelsi thought to herself.

Her poor butt was starting to hurt a bit. She could feel her asshole puckering in her panties, straining to hold all that gas inside. If she let it out now it would probably feel really good, but she couldn't. Sunny was still in the room, and didn't look like she was going anywhere. Forcing herself, Kelsi gulped down the rest of her meal. Her stomach grumbled at the additional milk, it was only adding to the intestinal instability her digestive system was going through. As she got out of her chair and put her dishes in the dishwasher, Kelsi could feel her colon filling with even more gas, begging to be released. She rushed to the upstairs bathroom, hoping she could hold it in for another minute.

----

Your whole world started moving vigorously, almost literally. Kelsi was pretty much the size of a planet compared to you in this state, so her being your world wasn't far off. As the giant girl's ass lifted off the chair everything was thrown sideways. The syrupy mucus lining her bowels started to slide downwards, and you went along with it. Gravity was pulling you down, it would otherwise be impossible for you to scale the enormous lumps of flesh that made up her anal walls. The disgusting river of filth that your body was stuck in carried you along, but also tried to pull you under. It was practically a miracle that you stayed afloat, rather than being dragged into the horrendous mucus stream and drowning to death. Instead you managed to keep your head above the slime, with the more slow and painful option of drowning in Kelsi's gas.

Without a doubt she knew by now that she had to fart, the bulging mass of air was too big to be ignored. If she was moving quickly now that means she was going to look for a place to let it out. Your first thought was the toilet, a gruesome fate for you that was all too correct. The hot slime carrying you slowed to a stop, right along the rim of her anus. The gigantic rubbery gateway trembled like an earthquake, forcing itself shut to keep the swirling gas inside. If Kelsi was going to the toilet then that would be the end for you. She was completely unaware that your tiny speck of a body was in her ass, she was going to fart you out and flush you away. You shuddered thinking of it, the last sight you were going to ever see will be her asshole farting you into a massive bowl. Her biological urges were telling her to do this, and there was no way your microscopic voice could argue with them.

----

When Kelsi made it to the second floor she saw that the bathroom door was shut. Just her luck. Desperately she knocked, hoping for her sake that no one was in there.

"Yeah? I'm in here."

It was Jada's voice coming from inside.

"Are you going to be long?" Kelsi asked

"Not too long." Jada said, to Kelsi's initial relief. "Just another 10 to 15 minutes and I'll be done putting on my makeup."

10 to 15 minutes?! That was way too long! And why the hell did Jada have to use the bathroom to put on her makeup anyway? She could have just done it in her room! Regardless, she got there first and that meant Kelsi had to wait. Dammit, Jada cared way too much about her appearance.

Kelsi felt her ass gurgle. Inside more gas bubbles passed through her colon. Her big sexy butt was filled to the brim, like a balloon about to pop from too much air. Her anus pinched, trying as hard as it could to keep the steamy air locked inside. The girl winced in pain. She had a choice to make. Either she waited for Jada to finish so she could use the toilet, or find someplace else to fart.