"No, Silly," Sarah responded, "Unlike you, apparently, I take these rules seriously. This is why the undeserving like you can't be trusted with the stone; you're bound to get it wrong. I, on the other hand, have thought ahead about this."
Sarah reached into her back pocket and pulled out her phone.
"This is what I'm using."
Turning it on, she showed an app to Jon.
"I just wished to have an app on my phone to control anyone I want in any way I want. And since I knew you would probably head this way to get your stone back, I chose you as my first target."
The phone screen revealed an image of Jon right down to the outfit he was currently wearing.
"So, you used the app to make is so I can't say Joan? I mean Joan. Damn it, I still can't say Joan. Sarah, this is frustrating. Please change it back," said Jon.
"Duh," said Sarah, "and I also made it so you would notice. By the way, we need to do something about that potty mouth of yours." She tapped the screen a few times.
"Sarah," Jon responded frustratingly, "This is rediculous. I can't go around calling myself by a different name. No one will know who I am. It will be flocking confusing. What the hall‽ That's not what I meant to say! Sarah stop fraking with me. I want to say what I want to fecking say! Durn it! Please stop this!"
"Oh, ha, ha!" Sarah laughed, "That is too cute. I know you are so angry, but your word choices are adorable. I might just keep that in place. Now, what to do with you next?"