Kelsi's stomach rumbled. After all that unpacking she was getting hungry. She went down to the kitchen to eat some breakfast, even though now it was past noon so it would technically be lunch. There she met Sunny who was rummaging through the fridge.

"Oh hey Sunny, can I get in there? I was gonna grab some breakfast." Kelsi said.

"Hm? Oh yeah sure, no problem." Sunny replied, stepping back to allow Kelsi to grab some food.

She reached in and grabbed several things. Bread, fruit, milk, a jug of orange juice, some butter, and then she went to get some cereal from the cupboard. After grabbing what she needed, she sat her large butt on the closest chair. Her generous backside made for a good cushion, seeing as the chair was solid wood. Sunny however looked at all this food impressed.

"You must be starving."

"Yup!" Kelsi said, arranging her meal on the table. "Unpacking gets me hungry I guess. What are you doing?"

"I'm just checking how much food we have for the week. By the looks of it we'll need to get more groceries, living with 5 girls is going to deplete our resources fast. Oh, and one guy. Have you seen him by the way? I was going to introduce myself."

"Nope!" Kelsi said, scarfing down spoonfuls of cereal "Haven't seen him at all."

"Hm, he wasn't in his room. If he went out I thought he would have at least told you where he was going. Oh well, I guess I'll introduce myself later." Sunny said.

Kelsi chugged down a glass of orange juice and then started buttering up her bread. Acidic juice and loads of milk wasn't the best combination for her stomach, but she couldn't help it, she was hungry! Her guts started growling as they processed the heaps of food, as well as her previous meals. Gurgling rumbles made way through her intestines and soon enough Kelsi felt the need to fart. She looked over to Sunny, who was still writing down a list of groceries to pick up later.

"Hmmmm, I need to let this gas go... But Sunny's right there... I can't just fart in front of her, I mean we're friends but that's still too embarrassing! I guess I'll try to hold it in..." Kelsi thought.

----

The inside of Kelsi's ass was a hell in and of itself. It was scorching hot, your own sweat was lost in the wet meaty walls, lined with anal mucus and other slimes. Her body temperature was roasting you alive, the puffy flesh of her ass hugged you on every side so you couldn't get away. It was uncomfortably tight, you weren't being crushed like you were in her anus, but every now and then her butt would squeeze, and you would become smothered in hot slippery muscles.

Worst of all was the smell. You thought that Kelsi's farts smelled bad, but those were dispersed in open air. The stink inside her big thick butt was ten times worse. Every breath you took reeked of shit, as if you were sticking you head right in the toilet after she had taken a huge dump. Her bowels smelled horrendous, you gagged and coughed up spit, but even after that the stench continued to assault you. It was a struggle to breathe, the little air you got was hot like in a sauna and burned your tongue. The taste of her ass was inside you, clogging your airways with its stink. Kelsi's cramped anal passageway was a place you weren't ever meant to be in.

You felt a familiar sense of weightlessness until her bowels came bearing down on you, a result of her now sitting. Before you could hear the ever-present thumping of her heartbeat, but now you could really feel it. The sticky tight walls of her ass hugged you even harder, adding the intense pressure of the girls body weight. There was almost no room to breathe, her bowels pressed around you like you were a log of shit and held you snug. You gasped for even the smallest bits of foul air, and ended up getting her disgusting anal juices in your mouth. Things looked rough, but they were about to get a whole lot worse.

Kelsi's guts growled above, sounding like booming thunder. The bubbling intestinal groans grew louder, becoming more ominous as they came your way. Suddenly the giant girls ass bellowed from right behind you. A rush of steaming hot air bulged out her anal walls, filling your wretched prison with gas. The temperature spiked, it was already sweltering before but now it was an oven, dripping with moisture. You could immediately feel the presence of her gas bubble, how it expanded her walls and made everything blistering hot. Given you last experiences, you tried to hold your breath, to outlast the fart, but it wasn't meant to be. Kelsi's anus bulged out, ballooning with pressure, but her muscles forcibly contracted, keeping the gas locked inside. Tears filled your eyes as you realized how fucked you were. She was holding in her gas.

Your lungs couldn't take it anymore, you had to breathe. Opening your mouth you took your first gasp of Kelsi's fart bubble, and immediately regretted it. Your senses exploded with revulsion, rejecting the horrid miasma that was your friends fart. It tasted like concentrated shit, burning hot fumes that were so thick you could practically chew on them. Suddenly you felt her tight anal walls loosen, the smothering hot grip of her ass separated itself from your back. Your heart sank, you were shrinking again.

Each breath you took was nothing but gas so it made sense that you were shrinking. As long as Kelsi kept holding in her farts you were going to continue to shrink indefinitely. The gurgling ass expanded around you, its throbbing walls becoming larger and more distant. You screamed in horror, right as another burst of gas bubbles reached Kelsi's backdoor. The stench multiplied and her massive anus bent backwards to hold it all in. You could feel her ass muscles twitching underfoot, the lumpy flesh rippled like waves as she strained her butt. More shitty gas filled your lungs as you continued to diminish in size.

You sobbed, trapped in the worst place imaginable, crying as the world grew around you. Your small pocket inside your friends gargantuan butt expanded to the size of a town, and then a city. The throbbing hot lumps of anal flesh were like mountains, so large that you could no longer stand above them. You became a speck, not even as big as a grain of sand, trapped deep within the crevices inside your friends gigantic bowels. At this point you stopped shrinking, but it didn't matter. You were beyond powerless and impossible to find.

Kelsi's plump butt purred softly in her chair, announcing its need to pass wind. She kept her ass clenched, unknowingly dooming her friend to save herself from embarrassment. On your end an earthquake of sound shook the chamber, sputtering more rancid hot gas from the girls colon. Her humid anal cavern became even more bloated with pressure, you could feel it bearing down on your tiny pathetic body. You were nestled between two puffy lumps of anal flesh, trapped in a pool of grime that was so sticky you no longer had the power to move. It was like your own hellish valley, a river full of mucus, slime and leftover shit. You felt too depressed to even cry anymore, your situation was too hopeless. Kelsi's filthy bowels twitched and strained from her gas, causing your river to slosh around. Eventually she would have let out this massive fart, but what would happen to you then?