The last time I had an 'I only want a bj so can I have it for less' idiot I replied with the following:'Not only do I charge for my time not per service but between you and I,I would rather you shag me with a condom on than give you a blow job without a condom where in all likelihood you will expect to come in my mouth.Not only is a bj with cim more risky for me in terms of the fact you may have an unclean and sti infested cock but it is more effort on my part rather than me just lying there and letting you fuck me.So I'm actually going to charge the next person who wants oral only an extra twenty quid and the next person happens to be you?What do you say?'
Funnily I got no answer....

Its riduculous for him to expect it cheaper especially if he is expecting owo your right its more risk then doing sex with a condom. They use any excuse to try to get it cheaper scummy lot.

I never entertain this type. Too likely they're arseholes anyway. Asking for anything in order to get a discount  is a huge block from me