"Me and Janet will swap bodies. When I'm in Janets body, I will get horny 5 times as fast as an ordinary woman. When Janet is in my body, she will like to force me to do sexual favors, most often against my will and I will be forced to obey her every command and I can no longer command her at all. Also, when Janet is in my body, her penis will become twice as long as mine is now. To make sure this doesn't cause too many problems, Janet will act as I would and forget ever being a man once we change back."
After thinking a little bit more, you add:
"When I'm in Janets body I will be able to wear clothing, though it must be very sexual orientated or revealing, of course even both. When I'm Janet I will retain all my memories, even when I turn back. When Janet is me her mind will think of sex much much more than normal, to maximize the times she takes advantage of me. To top it off, the change is immediate."
Instantly, you are looking up at.. well, Dave. You look down to see your body clad in a tiny black miniskirt with a pink tube top. Your huge nipples hurt a little when they poke through the top. You gasp and blush when 'Dave' reaches out and gropes your chest.
"Not a bad pair at all, now, you might as well get back to work, I have a few things to do."
You saunter over to your work station, feeling the jiggle and sway of your huge breasts in the thin clothing.