I have erotic and not vulgar picture idea for you two to take together. I think it could end up being pretty sexy!
Have the miss stand in a classy dress, high heels and panties pulled down(pherhaps knees turned inwards or something, that's always hot)
and the man wear business-suit pants and matching shoes, and hold his belt in the hand.
Use a self timer to take a picture from your waists down. Make it B&W and try ajusting the "levels" if you have photoshop. I think that would make a really awesome, and rough picture!
Let me know if you decide to go trough with it