As the sisters walked away, Katlyn had an idea. Aiming carefully, she shot a concentrated beam at the younger sister. The girl jerked slightly before releasing another loud, sputtering fart followed by a wave of sludge.
"S-Sis! I don't feel so *URRRP*" The sister covered her mouth in surprise, not expecting the belch. However, things were only getting worse for her. Combined with her butt becoming a bubbling swamp of muck that was engulfing her pants, she began to expand.
"Sis, wha-what's *URRRP*...ugh, wh-*groans* PFFFFFFFFTTPPPPPPPBPBBLLMFFFff...what's happening to me!?" The girl continued to expand as pounds of fat were added to her figure, her sister only able to look in horror before running off.
"Siste-*URRRRRP* ...ugh, where are you...*grunt* PFFFFFFFFFFFPFPFFFFFBHBHBHPTFTFFPHtt...*sob* where are you go-*URRRP*" The girl couldn't even finish a sentence without being interrupted by a belch or painful diarrhea spasm. Her clothes simply fell about when she grew too fat for them, as they were already pretty much destroyed by her waste. A constant stream of brown liquid was suddenly free to spread, combined with her bubbly farts poop flew in all directions. The girl closed her eyes and mouth in an attempt to keep poop out of them. She still vomited, though, and then began to sob out of disgust, panic, and confusion. Finally, however, her river steadied to a stream and stopped with a final bubbly fart. Regardless, the girl sat there covered in her own filth sobbing before she was suddenly pelted in the face with water. Sputtering, the girl tried to shield her face and look forward to find her sister holding a hose.
"Here, let's get you cleaned...up...hey, is it just me, or do you look kind of different? Did you change your hair?" She asked, trying to mask her surprise at how much fatter her sister is with humor. It seemed to work as she began giggling.
"You're hilarious." She said in a pitiful, broken voice.
"Oh, sis..." The older sister keeled down to hug the younger sibling.
"Wh-what!? Don't hug me, I'm...I'm fat-"
"I think you mean incredibly cuddly-"
"I'm covered in my own poop!"
"And I'm wearing pants soaked with my own urine AND my own poop. Ha ha, I win the gross Olympics. What's my prize?"
"Seriously sis."
"Seriously YOU. You just went through some serious shi-...I mean, stuff. And you don't know what's going on, I sure as hell don't know what's going on, but hey...atleast we got each other, right? Whatever happened to you, I'll help you through it."
The younger sibling gave one last sniffle before forming a slight smile.
"Thank you sis..."
The moment was ruined, however, when another bubbly fart escaped with a...almost happy sound? The older sibling looked up in confusion.
"Okay, that fart was adorable. There is literally no other way to describe that. How did you do that?"
"I-I didn't mean to, it kind of just escaped."
"Really? So, you just fart adorably now? Hehe, maybe this won't be so bad after all."
"Y-You think so?"
"Totally! Won't mind being around with those cute sounds." The younger sibling smiled with wishful thinking. Just then, against her knowing, a brown bubble started to blow out her behind, and just as is reached a rather large size, it popped with what almost sounded like a verbal sparkle. Once again, the older sibling looks onward with bewilderment.
"Did you just...okay, seriously, how did you fart a poop bubble and make it sound cute? I...can't even believe I just said that."
"I did what?!"
"You didn't know?"
"Wha-no! I just kinda felt...well, kinda hopeful for a moment. I didn't mean to-"
"Hold that thought." The older sibling then turned her head and sniffed the air.
"Okay, somethings been bothering me, and I think I finally know what."
"What?"
"It doesn't smell."
The younger sibling looked on in confusion before she realized she was correct; despite being surrounded by excrement, there was no bad smell to be had. The older sister swabbed a bit of the stuff off of her sister and brought it close for inspection. After a moment, she then put it in her mouth.
"Eww! Sis, don't put that in your mouth!" She shouted as the older sibling spit it out.
"It's dirt."
"What?"
"You heard me, it's dirt. It may have come out of you, but it is literally just dirt and water."
The younger sibling looked up in bewilderment. After a spell, she brought some of the substance between her fingers and rubbed it. It had a gritty feel unlike the slimy one she expected.
"So...I'm not cover poop?"
"Nope."
The girl gave a sigh of relief before falling on her back.
"Oh thank goodness! I thought I was stuck with eternal diarrhea for the rest of my life. I think I can live with being walking earth."
Suddenly, she was pelted with water again.
"Still have to clean you." The older sibling said with a smile.
"Okay okay, *giggle*"
All the while Katlyn was watching avidly, now feeling like she was going to die of diabetes. However, the implications of their discovery intrigued her. She was walking earth? How did that happen? Was there more to this gun than just making people shit themselves? So many questions, yet no reasonable way of answering them save for further experimentation. Katlyn decided that next she should...