Two giggling girls

Sarah came back into the room skipping childishly with a box in her hands. She opened it and started pulling out Barbie dolls of all different kinds. One was dressed like a mermaid, another like a princess, then another kind of princess, a fairy, and a ballerina. Most were pink, or partially pink, and all were overly frilly. Jon let out a bit of a sigh. If anyone found out he'd been playing with girly dolls, he'd die of embarrassment.
"Which Barbie do you want?" Sarah asked, her eyes bright.
"I don't know," said Jon, still keeping an eye out for the stone. Sarah sat down on the floor and started picking through them.
"How about Fairytopia Barbie?" she asked holding up a particularly frilly doll with butterfly wings.
"I guess," said Jon.
"Hmph!" she said, pouting suddenly, "I don't think you want to play with my dollies at all."
Jon bit his lip. He could be in real trouble here. Where was that stone?
"I bet it's 'cause you're a boy!" she said suddenly, "Boy's don't play right. I wish you were a girl, like me."
There was a flash from under Sarah's knee, and Jon barely had time to gasp before it happened.
His hair fell down around his head, growing past his shoulders. His chest tingled and throbbed as it began to grow. Two bulging breasts, appropriate for a teenage girl, pressed out from him, lifting up his tee shirt. He felt his manhood change as well, like a cold breeze shot through him, changing him instantly from male to female. Before he could even catch his breath, his jeans fell apart, and re-stitched together into a long skirt. His shoes changed, becoming tighter, then becoming oddly comfortable. He felt stockings climb up to just above his knees. Then his skirt changed from denim to lacey cotton, then to a strange lacy satin. It fused with his shirt, becoming an actual dress, pink, shiny, and covered with lace. Then his sleeves changed, puffing out with some kind of taffeta, and his skirt began getting crowded and thick with many layers of petticoats. He felt his new girly hair tie off into pigtails on the side of his head, and he felt makeup appear on his face.
During the whole transformation, Sarah just watched in awe. Now she jumped up clapping her hands.
"Yay! You're a girl now! We can be best friends!!" Jon giggled and started squealing girlishly with excitement. He really was just like Sarah now. Sarah took him by the hand and pulled him down to where the dollies are.
"Which dolly do you want?" she asked.
"The pretty fairy!" said Jon. He, rather she giggled girlishly. He remembered everything, though. The old Jon was still in there, but his personality was replaced. He still knew he needed to get the stone back, but playing with dolls was more fun! Especially with Sarah, she's so pretty and nice, and has the nicest dollies...