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As your partner gets more aroused during cunnilingus, you can begin introducing your fingers into the mix. Use one or more well-lubricated fingers to penetrate her vagina, simulating your penis. Again, start out slowly and build up a faster rhythm, while simultaneously penetrating her more deeply. (Don't forget to keep up the tongue action.) Your lover will let you know with body language or oral (sorry for the pun) indicators such as moaning or quickened breathing patterns.
Bonus Tip : At the point where you think you're finished performing, continue for another few minutes. Trust me, she'll be thankful.