The stone glowed and Karyn felt her body change. She seemed to become slightly taller, and not as slim, and she felt her breasts shrinking. There was a bulge in her pants which wasn't there before, and she felt hairs on her legs brushing against her jeans. Karyn looked at her new hands, which were strangely familiar...and hairy, with short, bitten nails.
"Oh my God!" shrieked Karyn, "What have you done to me? I'm a man!"
"Er...Karyn", said Jon, "That's not the half of it..."
Karyn looked at Jon. Despite the baggy t-shirt Jon was wearing, she could see a large pair of breasts and a slim figure underneath. Jon was slightly smaller, and she was looking down on him.
"What has happened?" said Karyn.
"Well, it seems that the rock decided to give you the nearest body - mine, which meant that..."
"You got my body", said Karyn. "So, what are we going to do now, wise guy?"
Jon thought for a moment. "Ah," he shoulted, raising a slim, manicured finger into the air. "I've got an idea..."