Just like what the others have said, do a nice job in PP and give them the thumbnail of the pictures. If they like it and want the full size image, then negotiate with them on the price.
In this way, you don't lugi and still show professionalism in your work. If you don't produce any image at all, rumours will spread that your photos are lousy, you are not professional etc etc.
By the way, is the couples one of your close friends?