That is so true. A woman who does that gains so much, she concquers you. When I look down and see that knowing smile, the twinkle in the eyes, she knows that she owns me.
The same feeling I get when I return that and do the same with a combination of tongue and fingers and lift her under the bum cheeks as she squirts into my mouth or on my face. They always meet up again or bring a friend.
Fellatio or Cunnilingus to completion is like a drug, for both sides.