Role play within a role play

Looking for someone willing to play a female character within the following scenario: a couple has hit a stale patch in their relationship and one of them suggests a role play to spice things up a little. They decide that she will go to the bar where they first met and wait for him; however she will act and be dressed as someone quite different; normally outgoing, flirtatious and vivacious, she will play a somewhat stern and conservative woman that he has to seduce and pick up. I'd be delighted to discuss details or make whatever changes you like.