Cunnilingus- oral sex

The Lick

Leaving your tongue soft and jaw relaxed, try licking her from vaginal entrance up to her clit and following the outer edges of her vagina along both sides. Repeating this technique going up and down and vice versa can be a great opener.
Labial Hold

While holding the two parts together with your lips, run your tongue between the inner and outer labia one side at a time.
Tongue Intercourse

The majority of a woman’s nerve endings in her vagina are around the opening and within the first couple of inches inside. Target them with your tongue by inserting it into her vaginal opening. Techniques are pretty limited due to the length of your tongue, but try moving your tongue in and out, as well as in circles around the inside of her opening.
The Flick

Spread her outer vaginal lips with your fingers. With your tongue pointed, gently flick your tongue around her clitoris. Feel free to roam, but keep coming back to her clitoris, as it is the most sensitive. This drives some women wild, and others find it to too intense. When stimulating her clit make sure to start out gently if you aren’t sure how she likes it. When you try this, pay attention to whether those moans are ecstasy or pain.

The following techniques should not be introduced until your partner is really hot (i.e., very wet). These are more intense techniques, and may be too intense for some women, even when nearing orgasm.
The Clitoris Suck

Expose her clitoris by spreading her lips and lightly pull back her hood. With her clitoris exposed, give it a quick little suck; pulling it into your mouth briefly and letting it go. This is a lot like licking a bit of cake batter off of your pinky. This feels incredible, and is a fine thing to do if you feel like tormenting her – but don’t overdo it! We recommend not using your teeth nor using heavy suction when starting out.
The Clitoris Hold

Take her exposed clit into your mouth and gently suck on it, simultaneously flicking your tongue over and around it. This can be done very lightly or very aggressively, and combined with fingering, will usually rapidly produce an intense orgasm.
The Tongue Tube

Roll your tongue into a tube (if you cannot do this, forget about it because it is genetic and you can't learn it). This technique works best in an inverted or 69 position. Roll your tongue into a tube around her clitoris. Slide it back-and-forth; in effect, your tongue is doing something similar to a woman's vagina around a man's penis. This is likely to bring any woman over the edge to an explosive orgasm.
ABC’s

Try using your tongue to spell the alphabet on her genitals. This works surprisingly well as your tongue is always moving in different directions. Learn her favorite letters and the orders that work the best!
Other Tips

A good lover’s hands never stop moving, so keep exploring, insert a finger, or massage her thighs while you perform.

You can also try using a wide variety of flavored gels, oils, and lubricants. Some of these products heat up when rubbed or blown to add extra stimulation.

Having a mint in your mouth while you are performing cunnilingus can also improve your results. The mint, as long as it is not too weak or strong, can create a very intense tingling sensation to enhance your performance.

Try some - or why not all - of the above techniques and neither of you will regret it. Techniques like this are sure to help her achieve that (sometimes) elusive Orgasm!