Sarah toys with them both.

"Now Karl...or Karyn, whichever you are...I'm eager to have fun with both you and your new friend there." Sarah leaned down and looked at them. "But I think you two are done with those forms for now." She muttered a wish under her breath. Suddenly Jon and Karyn sprouted back to their human forms...except theat their genders were still switched! Karyn was a guy, and Jon was a woman. Both laid their face down, naked on the floor. Sarah muttered something else and they were both covered in a blanket...but they still couldn't move. "Now.." Sarah said evily. "I have to power to rule the world in the palm of my hand...what should I do to you two little thorns in my side as a way of thanks?