I love sucking a cock on my knees, feeling his cock harden in my mouth. When his breath quickens I like to pull back so I can feel the cum jet across my tongue. I also like a man to put his hands on my shoulders and urge my onto my knees, it all works in my satisfaction too.
The act of surrendering control and allowing my mouth to be energetically used as a fucktoy is very erotically stimulating to me. It feels so good, similar to the way that you can't tickle yourself, it has to be done to you.