Sarah was a gaunt thin and greasy girl in Marias class. She would always watch Maria from afar, always jelouse of how beautiful and popular she was. Maria would always call Sarah names like lanky and man - face! and as such Sarah detested her.
So the news of these new pens made her almost wet with excitement of what she would do to her. she spent about an hour of the day thinking just what to do to her and couldnt decide....she already has a nappie filled with shit...so it has to be more embaressing.
It was only until gym class when they were all learning track running that she realised what she should do. They all got changed into their little tight gym shorts and tops. As always Sarah looked stupid in hers but even in her nappie Maria still looked sexy.
"Its now or never" she said to herself and got a pen out of her bag an took a peice of paper and wrote "Maria - a mans body but keeps her pretty face, make the cock and balls big!" she underlined big several times.
Now it was the middle of class and Sarah was wondering when this transformation was going to happen. She was answered when all the girls got back into the changing rooms after a hot and sweaty run. When all of a sudden Maria started to moan in a sickly way. she held her belly for a bit and the girls asked her what was wrong.
She replied but in a slightly...deeper voice "I dont feel so good" as she said that her chest began to make funny noises and shake as tehy sucked back into her chest which took some time! she screamed but in a very horse male voce "what the fucks happening!!!" she stumbled as she began to grow very tall and her shoulders widened and hulked!
Sarah was giggling to herself but also felt that she began to get...wet? was this turning her on.
By this time she was begginging to get very muscular and big and instead of her now tiny looking head it was hard to tell she was female...almost impossible "FUCK! my body! uhhggh what are you all looking at" one girl pointed "Maria your crotch!" her crotch was swelling bigger and bigger and bigger until her shorts and daiper ripped and shit and piss was dribbling everywhere. The size of the cock is almost undescribable it looked like it belonged on a whale and her balls where like big basketballs hanging down her legs!
"what the fuuuuk!" her voice now fully masculine "ive turned into a guy" she tried to move the big dick but all that happened was it started to get hard! and the loss of the Daiper meant that shit fell from her muscular ass onto the floor and her femenin face blushed!