He's never orgasmed from a Bj

Yul
This guy that I have been seeing and I started talking about our sexual pasts and he  told me in his 9 years of being sexually active he has never cummed from a bj. He's been with multiple girls so it's not like an ex was bad. But also he doesn't like when girls go for the balls. I really want to be the first one to make him cum from a bj any tips?!