It is not really about what it feels like for the girl. It is the what it is doing for the guy that you are doing it too. It is pretty awesome to know what you are doing is making him lose his mind. The more you get into it the more he just can't handle it and he has to just let it go. That is why we do it. Not for us for you. That is the pleasure we get out of it. You getting pleasure gets us off. Or should at least. So as far as how it feels it is like you would think it would be like. Soft and warm, and tastes like chicken. Lol. Kidding.
I think it is a turn on for both guys and girls. Its the thought of doing something taboo. Your lips, tongue and mouth have a lot of nerve endings so it is very arousing to the girl also. My ex boyfriend described it as feeling like vaginal intercourse with a lot more different types of stimulation. Your tongue, lips and the edges of your teeth. Just my thoughts