Absolutely not... if it bothers you, then he should be respectful of your boundaries and not be pressuring you to provide a service. I hate when people spend money and then act like they own you-- they are giving you money for services rendered, they didn't give it to you out of the kindness of their heart. You wouldn't see an accountant for 5 years and then say, hey dude so you I paid you to do my taxes for five years how about you do them for free this year? I had tons of clients like that when I was a stripper, after months of spending money they would expect that I would sleep with them outside. And I'm sure I'll be getting similar clients as an escort once I have regulars.
You have to go with what you are comfortable with, because otherwise you're going to feel like shit about it afterwards if it's not your decision, you're going to violated and like you were used. It's clear from your posts this service he is asking for makes you uncomfortable and you are only considering it because he is pressuring you... tell him to go do bareback with someone who actually offers it and not to come back and see you anymore as he is clearly not a respectful client to begin with! Asking for it once after months of seeing you, I would still frown and hold it against him but wouldn't drop him-- asking you repeatedly is disgusting!