How can I get my bf to give better oral?

My boyfriend is willing to eat me out, and loves the noises he can get from me.

But he tends to give just a few good licks, or a couple minutes before he stops & wants to just stick it in. And there have been a couple times he's stuck it in after just a few licks and I wasn't wet enough because he didn't take his time.

How can I get him to improve his oral skills, and take me to completion the way I do for him? Or at least stay down there longer before he penetrates?