Just an idea....what about a very Phantom-of-the-Opera-esque costuming....e.g. he wears suit and tails and a mask of his choosing (white or black, even red would be stunning) and gloves; carries a whip or cane; something to give him a very imperious, commanding presence.

You, on the other hand, would be wearing an almost see-through white dress (e.g. a very frilly nightie or something stitched out of organza or some other sheer fabric) that would give you a fantastic silhouette without being too revealing....

And of course, to top it off....

If you remember or know the show, you might recall the line, "Your chains are still Mine...."

You could wear silver handcuffs with a chain that ends in his hands, thus binding you to him throughout the night without gagging you or rendering you totally socially helpless.


Just a thought.