It took a few moments to realise that the woman in the bed wasn't her twin. Jack had forgotten that her own body had changed into the woman that Jacob had been calling Dana. Jacob on the other hand was in a body that resembled Sharon. They were both blondes but the Sharon body was older than the Dana body. The body Jacob now occupied looked more like a slightly younger Sharon.
Jack could only theorise that while they were having sex Jacob had come in contact with the medallion and an article of clothing that Jack had been wearing when he had the Sharon body. Jack guiltily remembered tossing Sharon's clothes under the bedspread to hide them when she had heard Rick at the door. At that stage she had barely started changing into the Dana body.
Knowing that there was nothing she could do for 12 hours, Jack climbed into the bed beside the now female Jacob. In a way she was actually a bit disappointed that Jacob wouldn't wake up with a woody. She was tired and quickly fell asleep.
...........
Jack woke to sound of a woman screaming. It was light and a naked "Sharon" was standing in front of Jacob's mirror looking at herself 'I'm a woman! Eaaaghhh! What's happened?'
'Shush! Calm down and I will explain. You just have wait twelve hours'
'What have you done to me? Change me back!'
'Try and be quiet. We don't want the world to know. Sit down and I'll get you a drink then I'll explain'
It took another minute for Jack to calm down Jacob. She covered the naked woman's body with Jacob's dressing gown and finally got her to sit down. Jack then put on the blue dress that had changed her then went to the kitchen to make two coffees.
A minute later there was a pounding on the door 'Let me in or I'll break the door down! I know she's in there! I recognise that scream anywhere!'