How to make oral more enjoyable??

My boyfriend loves to go down on me and I would be lying if I said I didn’t enjoy it. However, I can never finish from when he goes down on me, or sometimes it’s not enough for me to feel remotely close to finishing. I’m not sure if it’s just me, because the idea of him going down on me is just insanely hot, but I just can’t finish. What are some tips so I can actually finish this way??