You know when you bite into a really juicy piece of fruit, like a mango, and you have to purse your lips against it to make sure you catch all the drips of juice?
That’s exactly how to perform oral on a person with a vagina. Your whole mouth should embrace them. Over the clitoris and the labia, over the entrance to the vagina, so they can feel the warmth of your lips and tongue. The biggest mistake people make with going down on a person with a vagina is they think it’s all about just flicking the clitoris with the tongue and that’s it. That is extremely boring oral sex. You’ll turn a person off doing that.
What turns a person with a vagina on, however, is when their partner gives it their all. Show them much you love how they taste and how they smell. Bury your face right in between your partner’s thighs. Make noises against their pussy. Make out that you are eating something delicious and that you simply cannot get enough. People go wild over that kind of thing. Don’t lick pussy; eat pussy.
Never use a firm, erect tongue against your partner’s clitoris. It will hurt. Don’t tug and suck hard on the labia, either - that will also hurt, or at the very least feel uncomfortable and likely turn your partner off. Instead, keep your tongue soft and supple against the clitoris.
The entrance of the vagina is extremely arousing for a person with a vagina when stimulated. Think of the spot that gives you the most intense tingles, makes your thighs shake and causes aching throbs deep inside your pelvis when you’re stimulated there. That’s what stimulating a person at their vaginal entrance feels like, so make sure you serve generously. Use your tongue. Don’t be afraid to thrust your tongue in. Suck softly at that area, press your face in against your partner there, breathe your partner in (but never breathe out/blow air into the vagina - warm, gentle blows against the vulva is okay and feels very good, just never blow into the vagina).
Use your finger(s), too. Move them in and out of your partner while sucking on the clitoris. And I mean suck - don’t just lick it. Fuck your partner slowly with your fingers. Twist them gently, crook them against your partner’s g-spot, tease the entrance. Fuck your partner hard with your fingers by pressing them down against the vaginal wall, palm down, and thrusting them deeply, so your partner’s whole body is being rocked against the motion of your hand. This mimics the sensation of penis pounding in and out. Do that while sucking on the clitoris.
Let your partner’s body language and vocal noises and the way your partner grabs your hair and the way they plead or beg for more be your guide. Just remember to keep your lips soft and your mouth covering as much as you can manage - like, as I said, you’re eating an overripe, juicy, succulent mango..