Intro. Your secretary retired a few months back. You've learned to do her job as well as your own since she left, doing the work of two, which isn't too hard since your job doesn't require you to do much. She left a mirror behind that she claimed was magic. "Think about who you want to be, " she said, "and it'll come true."
Your boss insists that you get a new secretary because the company has funds put aside for her salary. You say that you don't need one, so he should just give the money to you, because you could use it, but he says that it doesn't work that way. But you get an idea. You use the mirror to turn into a woman and apply for the job. You can now change into her to do secretarial tasks and become yourself again to do your own job. You just have to look into the mirror and concentrate to change forms.
There's just one wrinkle. Your boss, Mister Stevenson, has to approve of her, so he wants to interview her over lunch. So you change into her and go meet him at his office.