Jon grumbled as he looked at the jogger's lower half now on his body. He guessed this is what the stone meant by "something interesting." Luckily, he made it back into his bedroom without any of his family seeing his swapped state. He took off the sneakers, pants, and even the panties. All were soaked with sweat from the jogger's run--Jon needed a shower more than ever. He threw on some of his jeans, which fit awkwardly, but he didn't think anyone would really notice. And put on some socks to cover his now painted toes.
When he finally got to the bathroom, it was locked. His sister Zoe must be inside. He pounded on the door. "Come on, Zoe, I really need to pee," he lied. The thought actually sent a shiver up Jon's spine--He'd be peeing out of a vagina from now on!
He sat outside, waited, and nodded off a little bit.
Zoe came out of the bathroom with a towel wrapped around her, "It's all yours, Jon."
She sighed, seeing that her brother didn't respond. She tapped him on the shoulder, and that's when it happened...
Zoe and Jon swapped upper torsos.
Jon woke up quickly. He looked down to see half of a towel that ended abruptly at his waist wrapped around his upper half with his sister's breasts underneath. He had her slender arms and skinny tummy. He looked over to see his sister in shock. The lower half of the towel had fallen off her now that the upper half was no longer supported by her breasts. Above the waist, she had Jon's body--very flat and very male.
Jon spoke first, "Look, Zoe, I think I can explain..."
