Feeling a little curious Jen decided to ask a rather odd question. "Susan? How often do I piss and poop?" Jen asked nervously as Susan shrugged. "Like every five minutes or so." Susan replied as Jen felt the tingle again. 'Great now I piss myself every five minutes,' Jen thought. She felt like slapping herself for asking such a stupid question in the first place.
Feeling pressure build up in her ass she involuntarily squeezed, a large brown mush of poop coating the seat under her as she felt a trickle of piss alongside it. "Well how do I keep myself clean then?" Jen asked, looking worriedly at her shit stained ass and piss covered legs.
"You don't Jen, you skin absorbs the piss and shit, that's why your ass is brown and your legs are shiny." Susan said as Jen felt the tingle again, her butt turning a lovely shade of brown as her legs started shining in the light. 'Well it could have been worse...' Jen thought as the bus pulled into the school.