Jon pondered his slip up and decided that the stone was extremely dangerous, so maybe it needed the additional safety factor that he'd seen in the movies. Yeah, 2-man control. Grasping the stone, Jon said:
"I wish that all future wishes are reversible and that
they must be agreed upon by a 2nd person."
Karyn paused and said; that sounds like a good safety, but it puts a crimp in some of the things I wanted to try. No it doesn't, Jon said, just tell me and I'll second it. Karyn blushed deeply and sheepishly admitted that there were some body modifications she wanted to try that were a little embarrassing to share.
After pondering a moment, Jon said that it's still not a problem, we just need to be a little more creative. For example, "I wish that Karyn has carte blanc approval to make body modifications within the confines of this cabin." Jon tossed the stone to Karyn. Now you need to approve the wish. When Karyn approved the wish, there was a brief twinkling, but no other effects.
Listen, Jon said, it's been a long drive and I'm feeling rather grungy. I'm going to go take a long hot shower. In the mean time, go ahead and play with the stone if you like. I think it's safe enough now.
As karyn sat with the stone thinking about things to try, she heard the shower. She got a funny smile on her face and realised that the safty restrictions limited her to body modifications within the cabin. Jon was within the cabin!?
Wait, think subtle and creative and FUN !
"I wish that Jon will get shorter at the rate of 1 inch per minute for as long as he's taking this shower."
Now to see how long it takes for Jon to notice. I can hardly wait! But each additional minute is worth it she smiled!