Tiff backed herself further away from her friend, but couldn't bring herself to peel her eyes away.
Katie fell back on the ground, panting in a mix of pleasure and pain as more changes began to wrack her body. The scant pubes around her new organ began to thicken into a full bush, more dark hairs beginning to push out on her legs and to a lesser extent on her arms. Her petite form began to stretch from it's current five feet. She began to look like a bean pole as her body grew to just shy of six feet.
The stretched out look soon began to fade away as her shoulders began to widen followed shortly by the rest of her torso, tearing her last piece of clothing, her shirt, off of her. Her once developing hourglass figure becoming more of a distinct V shape. Her pert breasts flattened out and widened, the nipples reducing in size as they became developing pecs. Muscle began to fill out her scrawny frame, abs tensing and untensing as the muscles began to define themselves, stopping just shy of a six pack. Her legs defined themselves, first thighs and then calves. Her feet growing in size, a bit larger than her current body would call for, probably showing for more growth in a few years.
Her biceps and triceps began to swell as her shoulders rounded. The growth continued into her forearms, veins becoming visable just under the skin. Her hands began to grow as well, also larger than proportion would call for, the paint on her nails fading away. More hair began to grow on her, patches sprouting from her under arms. A trail began to wind it's way up her stomach to her belly button, then beyond that to the middle of her chest where the black hair fanned out only slightly, a bit growing around her nipples too. A bit on the hairier side for a sixteen year old, but not too much so.
The changes next moved to her face. Her jaw began to square a bit as her nose became more pronounced. the make up she had so painstakingly applied that morning just seemed to fade away. Her raven hair began to pull back into her scalp, leaving just an inch length of hair, gelled up into a spiky style. A bit of a shadow of stubble appeared and grew out into sideburns, a bit more shadow appearing on her lip and chin. Katie, sighed and fell still, sweat glistening her new masculine body.
Tiff couldn't believe her eyes, where once her best friend was, was now a sixteen year old guy that could easily pass as Katie's brother. The face was still the same, just more masculine. Tiff ran over and knelt next to her friend as his eyes fluttered open. "Tiff? What?" She reached up and grabbed her throat when her deeper voice reached her ears. Katie looked down at her self then up to Tiff, panic in her eyes.