"Well...you could always ask the pen for a list of stuff that people have written since it came into existence. It'd give you...an idea of what we could do?" suggested Janet's boyfriend.
"Hm. You know what, that's a half decent idea. Congratulations, you keep your body," said Steve.
The relief on Janet's boyfriend's face was so apparent that Steve had to chuckle at him. He began to write on a piece of paper, 'A list appears telling me everything this pen has ever done to the world.'
Which it did, starting from the present magical alteration and working its way backwards.
"It has made this list appear."
"It has allowed you to manipulate Janet's boyfriend."
"It has made Janet your sex slave in a sultry attire."
"It has made Janet and you swap bodies."
At this one, Steve raised an eyebrow, and would like to have known more, but the list kept lengthening and lengthening, until the paper had to magically start extending all across the room.
"It has turned Brian Green's wife into a vibrating bed..."
"It has allowed Faye Harrison to fly, and also to get her first boyfriend."
"It has sucked Gordon McShaw into a hell dimension."
And the list went on and on and on. When eventually it seemed to be dying down, the room was literally full of paper, making it hard to move. Both Steve and Janet's boyfriend were perusing random bits on the list, each trying to find something particularly interesting, when each of their eyes' settled on something.
"Oh, how about this," they said symaltaniously.