It has been interesting to read the replies here- there are two main things to consider I think.
1) the importance of keeping a good regular sweet, the extra gestures that will keep him coming back, and the gratitude one human can show to another for being selfless as he is by organising this surprise for me.
2) the fact that this is a business, and that because of the intimacy of the job and the sensitivity of human fragile egos involved (his, not mine!) lowering a fee and then asking for more money if things turn frisky or for more money when we next have a booking with social time, could be a disaster.
I thought more as well about our current arrangement- we have one long booking a week. He pays me for 4 hours with a little tip. I let him stay for around 6 hours- that is just the way it panned out and it works as an excellent compromise seeing as he visits every week without fail (touch wood!)
Also, the surprise he is taking me on- he will no doubt expect kisses, cuddles and hand holding during the day- all of which are intimate acts and things that I would not do with him unless it was paid for. Finally, my partner would be incredibly hurt and suspicious if I was to go on what he would actually see as a far more intimate date than simply having sex with the client, and only charged half my fee- he would think I was going for fun rather than work. I am going for work with some fun as an added bonus.
Sooooo, I am going to charge the full rate for all of these reasons. Shagging for cash really is a headfuck for me sometimes, dunno about anyone else.
xxx