Holly was in HASS, about to give a presentation. She had argued with her mother about going to school today, claiming she felt nauseous, when really it was another reason. Holly had been having uncontrollable diarrhoea and gas for a week now, even sometimes not making it in the middle of the night. Taking a deep breath, she walked to the front of the class. The pain in her bowels was like a loose tooth - always there, but manageable. Clearing her throat awkwardly, she began her speech, which was about 10 minutes long. As pressure quickly increased in her behind, a silent wet fart escaped her crack. Taking a moment to sniff, she immediately recognised the strong, sickly sweet smell. A diarrhoea fart. She needed to find a bathroom very soon. Hurrying her speech along as well as she could with a clenched arse, she glanced at the clock worriedly. Only 5 minutes more until break. Just as she was about to reach a conclusion, she couldn't hold on any longer. A very long and loud wet fart splurged from her big booty like lava from a volcano, lasting at least 30 seconds before there was the sound of a rush and her panties completely filled with smelly mess before she could even clench. Her skirt expanding behind her, she felt the diarrhoea rising up her back and dripping down her shaking legs. At first there was silence. Then the raucous sound of laughter filled the classroom, tears of embarrassment running down her cheeks. The teacher waved at the door to her and she ran like lightning, her steps making echoing sloshes in the hallways. Leaving brown drips behind her, she rushed to the bathroom, still crying.