Rachel woke in the shower, uncertain of how much time had passed. She could feel the butt plug lodged in her ass and she remembered what the stranger had said. His seed had to stay inside her. That meant she could stop the change and avoid the horrible fate described to her by simply removing the plug. She reached round to pull it out but as her hand gripped the base she heard the door to the changing rooms open and the sound of a trolley clattering through.
'The cleaner! Shit!' she thought. She grabbed her towel, ran to her locker and squeezed herself inside to avoid being seen in her current predicament.
Time slowed to a crawl. Rachel couldn't move inside the locker and she knew that for as long as it took for the cleaner to do her job the cum inside her bowels would continue to remake her. She tried not to think about it but she couldn't help but wonder what might be happening to her body. Maybe it was her imagination but she could feel her breasts tingling and a throbbing in her clitoris that was detached from the feelings of arousal emanating from the rest of her pussy. It mortified her that she was getting turned on from thinking about becoming somebodies slut but there was nothing she could do to stop it for now.
After what felt like an eternity the cleaner finally left. Rachel eased herself free from the locker, her muscles sore from the cramped conditions but glad that the ordeal was over. Someone would be around to lock up soon, so Rachel knew that removing the butt plug would have to wait until she got back to her dorm. She got dressed as quickly as she could, struggling a little with her bra, and then she grabbed her bag and ran as quickly as she could across campus.