"Fucking bullshit," grumbled Kevin, still bemoaning his lack of nookie. "I wish that Sarah couldn't say no to anyone and would just do what she was told."
Unwittingly, Kevin had used his first wish from the wish chain since his hand was no longer touching the wishing stone.
Thankfully, Jon just looked and thought a little like Sarah, she wasn't the real deal so she was unaffected by Kevin's wish.
Therefore, only the real Sarah was affected and thanks to her own wish that was granted to Jon, Sarah was located at...