Kelsi strained to hold in her rising gas as she nodded along to whatever her roommate was prattling on about. She was hoping Sunny would leave for the store already, but her need to be thorough about everything kept her going on and on. Her guts issued a thick gurgle in protest and Kelsi winced in pain, finally realizing she was fighting a losing battle. Without another word she stood up and excused herself from the table, to Sunny's confusion.
Kelsi briskly walked down the hall to the nearest bathroom, entirely oblivious to the life or death battle going on within her own body...
---
Now at the lowest possible size you could go, Kelsi's rectum had been transformed into a vast dimension of its own, filled to the brim with thick miasma that threatened to suffocate you entirely. Your tiny form was crammed deep into a fleshy crevice inside her butt, repeatedly flooded with waves of slimy mucus and who-knows-what. You screamed bloody murder for someone, anyone to pluck you from this hell, but the only response was the thunderous roar coming from the girl's digestive system above.
---
Kelsi closed the bathroom door behind her and quickly shuffled out of her pants, not wanting to ruin her underwear just in case. She hovered over the toilet bowl and let one rip.
**PPPBBFFFFFFFTTTTTTTTBTTTTTTTT**
She was shocked at how comically long and loud it was and was thankful no one was around to hear it, especially Gabe. He'd never let her live that down. When she was sure she had no other business to attend to she pulled up her pants and fled the bathroom, feeling much better.
---
Just when you were finally coming to terms with the fact that you'd be spending the rest of your life as a speck inside your friend's ass, suddenly light tore into your realm. Before you could even react all the pent up gas instantly flooded to the opening, effortlessly picking you up along with it. You screamed from a combination of fear, revulsion and possible happiness as the rippling fart detonating around you threatened to blow out your eardrums. As you spiraled in the air over and over light flooded your vision entirely blinding you.
When you could see again you were free falling in the air just like a sky diver. Kelsi's bare ass loomed above like a hovering space station and below you could see where your destination was-- the toilet. You screamed as the air violently whipped around you and after what felt like minutes of falling you slammed into the cool toilet seat and skidded across. Instantly you tried to stop yourself best you could but before you knew it you felt your legs slip over an open space and you knew this was it. Digging deep and putting the last of your strength into your forearms you managed to finally stop your momentum, clutching the edge of the toilet seat with your legs kicking over the churning abyss below.
"Fuck, fuck oh fuck," you were practically hyperventilating. You couldn't believe how small you were! The toilet seat stretched all around you infinitely, it was as if you were on the surface of a new planet. Above you watched Kelsi pull up her pants.
"Kelsi!! Down here!!!" you screamed, but it was useless. With no reaction to your tiny voice she turned out the light and closed the bathroom door, leaving you alone with her lingering gas in the air.
Okay, I can do this. You thought to yourself. I just have to hang in there until I grow back.
You were slowly starting to grow back but it was still not enough to climb over the toilet seat rim. Your arms were getting numb but you were still hanging on for dear life. Then your eyes widened as you felt vibrations in the ground below. No no no please god no you thought as the bathroom door tore open. The light was flicked on, causing you to squint. When your vision returned you gasped, because looming above was...
