Lisa made her way to Chemistry, sitting down in her usual chair. Just as class was beginning to start, she could feel her arms and legs lengthening, her muscles growing for some reason. She looked around, wondering if anyone else could see her change.
Lisa felt a pair of testicles descend from her nether region, as her vagina completely disappeared. Suddenly, she felt her face morph into someone else. Lisa took out a mirror and looked at herself. She was turning into Josh!
Lisa's hands grew larger, as her muscles began swelling to match Josh's proportions. Her/his arms swelled, eventually becoming almost 21 inches around. Lisa watched, as Josh's large pectorals grew before her eyes, he breast tissue long gone. They stopped when they reached his usual 55 inch barrel chest.
Next, Lisa watched Josh's legs grow to an immense size, her petite jeans morphing into a large pair of Levi's to match Josh's monstrous quads and hamstring muscles. She felt Josh's abs begin to tighten, first becoming a six pack, then an eight pack, as his obliques came into prominence.
Finally, Lisa grew into Josh's 6'4" height, as her small-sized shirt was replaced with the football jersey Josh wore to school a few times a week.
"Wait," Lisa thought, as she looked around her, noticing no one else had noticed her morphing into Josh. "Which class does Josh have first?" Suddenly, Lisa was transported to another room, one she swore she had been in before.
Lisa looked around, noticing how much smaller everyone was now. Then she glanced in the corner of the room. It was Chloe! She was waving at her, smiling dreamily at her as she did so.
Lisa watched as the teacher walked into the classroom, beginning his lesson.