My ex-boyfriend was also someone who almost never finished from oral sex, the first night we were together he came from a bj in about 40 min, I was like “finally omg” and he explained me that normally that doesn’t happen.

He was always able to cum from my blowjobs, we talked about it and he said two reasons;

Because I was good at it - that obviously affects it, I was basically a virgin when we had sex so I listened to all his advices on how to do it (tighter grip, hands moving at the same time as the mouth etc) and I think it’s really important to know what other person likes

Secondly, he said he was very comfortable with me and that made it a lot easier. Feeling close and comfortable is also very important and depends on the person you’re having sex.

Basically I think the right person probably could make it happen, you just have to try and see