You see, I've had this picture in my head for a long time of how I wanted my wedding to be, and I can think of no better way for you to demonstrate your commitment by giving up your very identity to me - becoming completely and totally mine, until death to us part. So you're going to change yourself completely for me. I'm going to mold every part of you until you pass for a woman in that dress, and then I'm going to parade you out in front of our witnesses as my beautiful bride. I'll have your name changed just before the ceremony, and you'll only know what to be called when you're asked at the altar to say "I Do."
And then... we'll consummate the wedding, as wife and wife. I'll let you use a strap-on on me for the first time, forgetting at last that your little pecker even exists. You'll lick, finger, and finally fuck this beautiful pussy for the first time. And I'll do everything I can to make it the most erotic sex of your life... Your cock will scream with frustration and lust against the walls of its cage, your every nerve ending crying out for release...
But that's a long ways away. There's so much we need to accomplish first...