How can I get my bf to be more rough during sex and prove to him it doesn't hurt

We've been dating and having sex for over two years. And I like to be dominated during sex, I like it when he makes me his slave. I'm by definition a twink, and he's kinda a jock, Still slim like me but has a 6 pack and stuff. So I love having someone bigger than me fuck me. I like it when he commands me or force face fuck me while im sucking. Stuff like that, and he likes that too. But i'm into things like choking and being tied up. Which he'll play along with, it not as if he's uncomfortable with it, he just doesn't want to hurt me. We have a safe word but he doesn't do anything hard enough to need it. Last thing, I'm into ballbusting, weird I know but I love the idea of getting dominated like that. He doesn't like doing that all cause of the hurting thing. Which it really doesn't hurt me much at all and I'm not into busting other guys. Don't get me wrong, sex with him is great and he obviously enjoys it and the stuff we do. But I think it could be so much better for both of us if we took it further.