"First, I wish Karen and Sarah McMillian were downstairs, watching TV."
The stone glowed momentarily. He went to the top of the stairs and looking down into his living room. Sure enough, Karen and Sarah were sitting there watching Gossip Girl together.
"OMG, I don't know WHY I'm hanging out with you two losers," said Sarah. Karen sighed. "You can leave at any time, Sarah."
John smiled, and went back in his room. He held the stone. "I wish that, the next time I take a shower, Karen and Sarah will both suddenly realize how great of an idea a threesome with the two of them and me is, and feel the need to act on it immediately."
He paused. The stone glowed. "I wish that, for the next 10 days, Karen and Sarah will get this simultaneous threesome urge once a day, each time when I'm in a different location."
He paused again. The stone glowed again. Downstairs, Karen coughed. He had an odd thought. "I wish that, each time I have sex with Karen and Sarah at the same time, I will become 10% more female, and that by the end of the 10 days, I will be a very attractive female version of myself. I wish that no one will notice that I'm changing except me, and that everyone else will think I've always been as female as I am at any given point."
The stone accepted these wishes, as well. He walked into his bathroom, and started the shower. Here goes nothing...