Sunny's ass looked gigantic from where you were sitting. Even though she was wearing sweatpants you could see the enormous curves of her ass, the soft fabric held tight against her ass and thighs. She bent down slowly, pulling the fabric deep into her looming butt. You had nowhere to run to, and even if you did turn tail it was only a few seconds before Sunny's ass slammed down on top of you. Her amazing cheeks spread as she pulled the chair closer, giving you a good look at how huge her booty was. Your only chance was to get her attention, it was now or never. You yelled out.

"SUNNY DON'T SIT ON-"

Thump! The unaware girl's colossal behind crushed you. Her cheeks were spread enough through the sweatpants that you felt her crack pressing down on you overhead, but you just happened to be lucky enough to not be completely flattened. Sunny had enough junk in the trunk to break her fall, and the hefty mass of her butt cheeks kept you from being squashed by the entirety of her body weight.

Sunny's sweatpants were damp in the middle, they had been absorbing her ass sweat for the entire morning. The result was that her butt crack was incredibly stuffy, and reeked with the smell of salty ass. You took short breaths of the warm air from under her butt, and could practically taste her sweat in your mouth. The earthy girlish smell had permeated through her soft pants fabric, creating a humid sticky environment that you were stuck underneath.

Sunny calmly ate her lunch up above, shoveling spoonfuls of the beans into her mouth. After several minutes her body began to react. The gigantic ass that was smothering you started to gurgle. Sunny blushed.

"Uh oh, the beans are already starting to make me gassy..." she said, embarrassed.

"Really? Ha ha, that was fast!" Alexis laughed, eating her share of broccoli. "You might as well let it all out now. That new guy isn't here, so feel free."

"Yeah, why not? It's just us girls." Kelsi agreed, taking a swig of milk.

Sunny felt her stomach with her hands. She could practically feel it bubbling around. It was just going to give her cramps if she held it in, so she might as well.

"Alright then..." she said and started to push it out.

Her huge booty growled in the chair as hot bubbles of methane started travelling south. Sunny was pushing with her muscles, straining to get the gas out of her body. From underneath the fabric of her sweatpants her muscles flexed, pushing in and out as she worked the gas on through. You realized that her asshole must be directly above you, and it was bulging out as the girl pushed with her butt. Repeated the anus pressed into you, stomping your tiny body with sweaty crushing thumps. The intestinal groans grew louder, you could hear her gas as it got closer. You begged for her not to do it, hoping in some way she would hear your voice.

"Please Sunny! I'm right here!"

Sunny arched her back, pressing her round behind into the seat. She gave one last push with her butt, and let out a cute grunt.

Her anus roared in the chair, sputtering a huge load of hot gas all over you. The fart rang out for several seconds, loud, and rumbling her butt cheeks in the seat. Kelsi and Alexis both raised and eyebrow, there must have been more than just beans in that one. You were forced to take the blast head-on, the stuffy smell of her ass was immediately overtaken by the blazing hot stench of her bowels. Sunny anus vibrated through the sweatpants, buzzing against your body as she pushed out the huge swirling fart fumes. Her gas smelled rancid, it was a more potent smell than even Carmen's farts.

As the fart died down you felt the familiar sensation of shrinking. It was hard to tell since you were being smothered by her ass, but you knew that the hot steamy crevice you were stuck in just became a lot larger. The smell of Sunny's fart wouldn't go away, the cloud of gas was sticking to the moisture of her sweaty butt and sweatpants. You coughed and coughed, but more rank fumes filled your lungs. It was awful, but then things got even worse.

Sunny scooted her ass back a bit to get comfortable. It was a tiny movement, but at your size it was like the world came grinding over top of you. You got caught up in the fabric of her sweatpants, so tiny now that you fell into the weaved nightmare of smelly threads. Tiny micro-sized strings held you in place, making sure you were stuck inside the unaware girls butt for the foreseeable future. You wrestled with the threads but it was no use, you were stuck. You prayed she didn't have to fart again soon.

Sunny finished her meal and got up from the table. Her ass cheeks popped back together, smushing you between their thickness. You were right in the epicenter of her butt, whatever sweat she built up in her butt now, it was going to start here. She said goodbye to Kelsi and Alexis, letting them know that she was hitting the gym. As the girl began to walk away her ass cheeks started to grind together. These next couple of hours were going to be a painful. How did you get out of her sweaty fabric?