Squatting..... over his cock, mouth or with my partner (I'm Bi) laying on their stomach and me pressing my crotch against their ass and letting go.
Standing as my partner kneels while going down on me, my legs spread and their face pressed against my pussy.
The 69 position works but usually I'm too preoccupied to be enjoying it as much as I should.
I'm really not a big fan of peeing on someone's face nor receiving it on the face. In the mouth is okay.
If there's body contact as I'm peeing, example; his cock is against my pussy as I'm peeing, I go crazy!