i personally dont think its best to 'surprise' anyone.. particularly in the heat of the moment.. (although it never hurts to ask for the odd slap on the butt at times )

i have heard where people have used similar to denuseri's advice and it has worked .. also if your very submissive.. have you considered that he has unconsciously picked up on this and is drawn to this.. it may not be as large a leap as you think.. but go slowly.. explain your feelings..... then work up to your fantasies.. fantasies can be extreme....

if you are serious with this person.. sit down and talk to him.. romantic candlelight dinner.. and sm101 or roses without thorns book (or any similar you feel comfortable with) in your handbag...

smiles.. thats my thoughts for what they are worth.. hope you have an amazing time and it all works out for you.. (and remember always.. sane safe consensual.. ) xx