The best BJ's are from women who like sucking cock. They saviour it. They lick and suck the balls. If you are really lucky, they rim out your asshole.
In my experience great cocksuckers are older.
But I have had a few great experiences with younger women. When they accept that I really do love eating pussy, and want to spend 30 minutes sucking, smelling, tasting, licking, looking.... and I want them to cum a number of times....
They tend to want to make a blow job a significant event.
I did a POV BJ scene with Monica Maple last week, where I indicated that I needed 10 minutes of video. She thought 15 was in order!
We get a great scene