"You will have an almost constant need to poop, so much so that using a toilet is useless cause you'll only clog it. You'll have to use your pants, or a diaper if you can find one to fit your fat ass." She said with a sadistic smile.
"What? Are you kidding?" Tricia asked in disbelief. she was suddenly very aware of the sensation Samantha spoke about, the urge to poop almost overwhelming but not so much that she couldn't hold it. She farted loudly again, still annoyed and embarrassed by her apparent lack of flatulence control and the fact that it made her posterior jiggle. She wasn't sure if the jiggling was the worst or best part of being fat. She hasn't been fat long enough to tell, quite frankly.
"Look, the fat and flatulence is inconvenient and embarrassing as hell alone, but the need to fill my pants with...waste? That's just plain gr-" Pfffffffffffffffft...pffft...pfft..."j-just plain" Pffft pfft pffft pffft pffffffffffffffffft..."ugh...j-j-ju-" PFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFfffffffffffffffft..."oh god..." Tricia's body started freaking out as fart after fart forced its way out, forcing the poop along too. The poor girl was barely holding back the first wave of her never ending bowel movement, and her flatulence was actively trying to work against her it seemed.
"You were saying?" Samantha said with another sadistic grin.
"Come on, Sam, I like these pants! Grrrr....PFFFFFFFFFFFFT...*gasp* and...ugh...Pfffffft...pfffffffft...pffffffffffffffffffffft...god damn it, don't make me shit myself! That would be an actual probl-UUUGGH...PFFFFT...PFFFFFFFFFFt...PFFFFFFFFFFFFFFFFT...god...PFFFFFFFFFFFFT...make...Pffft...it...PFFFFFFT...STOP...PFFFFFFFFFFFFFFFFFFFFFFFFFFfffffffffFFFFffFFFffFfFFfffffffffffft-Pffft-pfft-pft-pft-pft
The pain was starting to become unbearable, and even when using all her strength Tricia was barely holding her inevitable boom boom back.
"You know what you have to do, Tricia." Samantha said, not even a hint of mercy present in her voice.
"Oh god, Sam, please...UGh..PFFFFFFFFFT...Pffft...pfffffffft-pft-pft-pft...please don-AGH...PFFFFFFFFFFFFFFFT...*sob* I...I don't want to shit myself *sob* pleaseeeeeeeEEEEHHHHGh...PPPPFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF-PFFFFFFTT-PFFFFFFFFFFT-PFFFFFFFFFT-PFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFT-PFFFFFFFFFFFFFFFFFFT-PFFFFFFFT-pft-pft-pft-pft-pfffffffffffffff...*loud sob*
"Umm...Tricia?" Samantha asked with a hint of worry. It was too late. The girl was on her knees sobbing so hard that no sound was coming out. Poop was slowly pushing its way into Tricia's pants, and no matter what she did, she knew she couldn't stop it. She could feel the large load slowly make its way into the back of her panties, squishing against it and up against her butt. That was it. There was officially shit in her pants. Sobbing more intensely, Tricia conceded and began pushing the load into her pants. It felt absolutely horrible, to have something forced against your will; especially if it were something as disgusting and pathetic as shitting your pants. The bowel movement began to quickly fill her pants, leaving no spot on her now massive butt un-touched. As Samantha explained, the poop was practically never ending, and she could just feel her pants tighten and tighten as she gained almost no relief from the release. She wasn't even crying anymore, just staring dead forward like all life had been sucked out of her.
"Oh shit, Tricia!?" Samantha was now worried. Very worried. Ignoring the smell, she ran up to her friend to check her. She immediately turned off the infinite shit, and stopped Tricia's pants from expanding any further.