Mortified, Jen dropped the chalk and made a run for it. Everyone was too shocked to follow her and probably did not believe what they had seen. She ducked into the girl's bathroom, checking to make sure she was alone. In the mirror she could see that her arms, shoulders and back had swelled with heaving muscles. Tentatively she lifted her skirt, afraid that she knew what she would find. A thobbing three inch bulge confirmed that something was definitely wrong. Lifting the lacy waistline of her panties she could see her massively engorged clitoris swelling from its hood, almost looking like a small uncircumcised penis. A small dribble of fluid leaked from its end as she felt a series of small contractions between her legs. Exploring with her fingers she was horrified as she felt her testicles drop. Curious, she began stroking her small penis which was slowly growing in length and girth, one hand absently fondling one of her breasts.