Hm... nailing it down to just one might be a little difficult, but if I were to go with my gut, I'd likely land on facefucking.

The idea of taking full control of someone's mouth and using it like a living fleshlight is just too exciting.

Whether it's sitting back on the edge of a bed with my hand pushing down on the back of their head, thrusting into them while I'm on my feet, or putting their mouth in a mating press as their head lays off the edge, it all just drives me insane~

And it goes without saying, but it being excessively sloppy and an absolute mess is a must. If you're on the receiving end, I want your chin and lips soaked in our hard work as it streams down to the floor in a pool~