Well, the best way to stop Sarah is to make her taste her own medecine. So when Jon is finally alone he hold the stone and say.
"I wish Sarah was at her home, 4 month pregnant of triplets and her parent just discover it."
Sarah in the blink of an instant find herself in the kitchen with a rounded belly.
"What the... son of a bitch !" She says when she hear a big yelling.
"You're in a great trouble darling !"
Well now... what to do with your status ?