A. Every lady here is different, but most of us will increase the price significantly from a single to a couple party. It might not quite double but it will be more for most of us ladies.
B. Once again every lady is different, but for the most part its really not done on a hour to hour basis. When you do your negotiations you will decide on a time, activity, and a room, and your price will be determined as a whole for everything.
C. I have used them several times and in my opinion it really doesn’t take away any feeling, the only thing that changes is that you don’t feel the saliva, which is really far from important in terms of orgasum.