Tom looked at his pants and saw the buldge slowly shrinking. He lifted the pants and saw his penis reverting into his body, only leaving a slit, which looked like a vagina.
"What us happening?"
Then he felt a tingling on his whole body. Tom was not a fat boy but he was clearly overweight. Now the fat was vanishing. He got skinnier and and his bone structure started to change into a more female stance. Then his breasts started to grow into a nice c cup but the bra was still loose.
"So I am female now. How is this even possible?"
Then her butt started to expand and she lost more fat of her belly until a small six pack was visible.
"Oh I got a six pack."
Tom felt her butt and noticed that she was not touching fat but hard muscles.
"What the..."
Then she saw her abs growing into a more defined six pack. Then her leg muscles started to expand. Then her pecs enlarged and pushed her breasts into her bra. The her shoulders broadened and her back muscles expanded to form a strong defined back wich looked more like the one of a professional male bodybuilder then the back of a teenage girl. Meanwhile her face became more feminine. And as her muscles grew bigger she also got taller from 5'6" to 6'1". Her arms started to grow and her biceps inflated into the size of a small football. All over her body veins appeared and with every heartbeat her muscles got bigger and stronger. Her heart and her lungs were growing too to support her new body. Her legs pumped up like someone was pumping ais into them but it was pure muscle mass what was filling them. Her six pack now grew into a strong eight pack. Her arms got thicker and her pecs enlarged even more. Her neck was growing stronger and bigger until she had a neck better then the one of the best bodybuilder. She made another growth spurt but this time a big one to 8'2". Now muscles grew even faster. Her arms inflated to the size of watermelons, her legs got thicker than big tree trunks and her pecs looked like big barrels attached to her chest. Then the growth stopped.
"Wow what just happened?"
She tried to look down her body but her pecs were blocking the view.
"I need to see myself."
She hurried to the bathroom. The had problems to fit through the door frames but she managed to get to the bathroom without causing any damage. In the bathroom she looked at herself in the mirror. She was huge. The swimsuit now fit very tight but perfect. It now looked more like the gear of a female bodybuilder now between all her muscles.
"I think I can win any bodybuilding contest now."
Then flexed her muscles and marveled at them as her veins popped out and her biceps rose up. She could feel the raw strength and wanted to use it.