Katie brought her hands up to her face, where the feeling seemed to be most concentrated, like something was pushing its way up through her pores. Brushing her hands against her cheeks and around her mouth she felt very fine hairs growing in, gradually becoming longer and thicker.
Tiff saw this, opened up her purse and tossed Katie a small mirror.
Catching it, Katie held the mirror up and examined her face. By the time she looked the hairs had already stopped growing. She now had a slight mustache and beard, not to mention sideburns. Her features were still feminine though, making the light layer of hair even more alarming.
The changes weren't over though, the same strange feeling spread to the rest of her skin. Looking at her arms she saw that the hair there was longer and thicker too. A tickling on her stomach and chest prompted her to lift her shirt to reveal that a little happy trail had grown up to her navel. Disbelievingly she ran her fingers through the little stretch of hairs that had grown along her stomach. Since the tickling continued she lifted her shirt higher and saw that there was a light dusting of hair across her sadly small breasts.
When the feeling stopped she had the body and facial hair that one would expect of a teenage boy in the early stages of puberty. Katie was ready to assume that the worst of it was over when she heard Tiff gasp.
"Katie, your face!"
Looking in the mirror again Katie saw that her features were loosing some of their feminine softness, but the changes were not evenly spread. Her nose and cheeks were clearly boyish, but her lips remained full and her eyelashes remained long and undeniably girlish. As before, the changes weren't limited to her face.
Her already small breasts deflated, letting her bra hang uselessly against her flat chest, before her shoulders began to broaden, forcing her to remove both her shirt and bra before they became too tight. Though her breasts had vanished, her nipples remained larger than those of a boy. Her muscles grew slightly, giving her a nicely defined, but not overly bulky body. It was lean muscle, like that of a dancer or gymnast.
The changes went on elsewhere, her hands grew slightly larger and more masculine, as did her feet, forcing her to remove her shoes. The most dramatic change, after the loss of her breasts, was the narrowing of her hips. Even as her legs and stomach grew more muscular, her hips grew thinner, causing her skirt to hang oddly across her changed form.
Fear of what was to happen next made her bring her hand to her crotch, just waiting to feel it fill up with new anatomy, but that didn't happen. For several seconds Katie stood holding between her legs as though she was afraid something was going to fall out. Finally the tension became too much for her and she risked a glance into her panties, only to see that her pussy was just fine, though perhaps the hair around it was a little thicker.
"I think it's over," Tiff said, sounding very afraid, "I looked at the label again and it was past the expiration date. There was a warning that if taken past that date the changes wouldn't be complete."
Hearing this, Katie began to cry, creating a very odd sight indeed. She was a rather effeminate looking boy, wearing nothing but a skirt, under which was a perfectly feminine pussy, while crying bitterly in the dusty kitchen of an abandoned house.