Jen continued to expel her sonic shit every 5 minutes, spraying whatever or whoever was unfortunate enough to be behind her with her excrement.
Jen sat bored in her English class, the teacher droning on about the archetypes of Shakespeare for the third week in a row. Suddenly, right after letting out her fourth shit of the class, a disgruntled student behind her calls out,
"Holy fuck, it's like you're always shitting tons of shit out of three huge horses' asses!"
Jen froze in fear as she felt an incredible pressure build up in her intestines. She groaned as she couldn't fight the mounting pressure, letting out an explosion of shit. Seconds past, then minutes, Jen realizing after 10 minutes had past that the pressure never let up, and that she continued to shit permanently. She also groaned as she felt her legs and ass change, her ass growing to match her tail into a massive shire horse's hindquarters. They absolutely dwarfed her upper body, huge and spraying copious amounts of shit behind her, yet still she was clean.
Jen then yelped out in pain as she felt two growths painfully bud from her sides as the second part of what the student said came true. She felt the growths expand, become copies of her "original" ass. Jen was now saddled with three huge shire horse butts, each spraying absurd amounts of shit behind her, now causing her to coat the entire back third of the room in her never-ending shit tsunami!