I don't know about getting his tongue deeper inside of your vagina. I think he should keep his tongue on your clit more and less in your vagina.
Now, if by "riding his face" you mean him lying down and you straddling him, then I have some advice. His neck can get tired if you don't orgasm very fast, so it's good to take a few minutes to wedge some pillows under his head to get in a nice comfortable position. This will help keep his face pressed against you. It can also be harder to breathe especially if you are not shaved because his nose will be pressed against you more than if he was on top. You also want something to hold onto, like the head of your bed, so that you don't move too much (or fall over!) when you orgasm. This way he can keep licking during your orgasm.
As far as 69 goes, the same thing applies about the neck getting tired. It's also good if you are anal about keeping your ass clean and smelling good because his nose will be right by your asshole.
One more thing, try not to wake the neighbors :wink: