For start get the terms right. Don't ask her if you can eat her out, suck her off or chew her cunt. If you have to ask, and hopefully you don't as it should come naturally as part of yours and her lovemaking, say something like. May I make love to your pussy or, as I prefer and think is more scene setting, your cunt. And remember its official title is cunnilingus although few nowadays use it and even less would know that, but she might and could use it, though oral sex is probably more common and frequently used.
What we are talking about is yes, a form of sex and any sex when performed properly is romantic, intimate, pleasurable, exciting and, hopefully, satisfying. And that's exactly what 'eating a woman's cunt' out should be. Ok you may not or, more to the point she might not receive and enjoy all five of those but three or four is essential unless you are going to become known as, 'billy no good down there.'
A big don't is doing it suddenly or too soon. Don't sort of dive down there and start licking her. It should not be a sudden move without some pre-oral lovemaking. Lots of holding her, kissing stroking and fondling that should relax her, get her used to you if it's a first time and arouse her.
Talk to her. Ask her how she feels, is it ok, is there anything she'd like? You never know you might get lucky and her reply could be.
"Yes, fuck me in my ass," unlikely but possible.
If you get no additional invitations or rejections then start your hands and mouth on their southward journey down your lover's body. Now unless she pushes you to hurry or urges your head downwards the key advice no, more than that, the main stipulation is go slow, or even go slower than that, go very, very slow. Orally anoint her from her neck which, incidentally is a hugely erotic area and licking and kissing it with her head pushed up and back is a massive turn on and hugely enjoyable for most women, and remember that's what this is all about; her pleasure and arousal. Yours are an aside.
Now orally anoint means using your mouth to fondle and caress your lover. It's not biting or aggressively sucking, though they may play their parts later. But at this stage gentleness, soft and smoothness are the aims nay, the essentials. You must resist getting carried away and keep in mind that this is for her and not you. Nevertheless, the more she gets the more she'll give back so if you do it well you will get a massive return.
Obviously, as you move your face from her mouth, down her neck and across the flatness of her upper chest, kissing and licking as you go, you'll reach one of her key erogenous zones, well four really if we are being a little pedantic, Both her breasts and nipples! And what a wonderful area of her body this is waiting for you, your hands, fingers, mouth, lips, tongue and teeth. Again, take things slowly and be gentle and smooth but she is bound to appreciate the whole surface of her breasts being licked, kissed and sucked. If you have, as you should have by now, aroused her properly her breasts, irrespective of their size should be feeling full and heavy and she should be feeling a tingling feeling and a warmth filling them. I can tell you from extensive experience that it really is such a wonderful set of feelings that she should fully appreciate.
But please take your time and don't be afraid of addressing other places at the same time. Remember by stimulating two erogenous zones at the same time, perhaps licking a breast and stroking her clitoris or gently biting a nipple and fondling her lips that should be now be nicely wet, she will enjoy something very special. It's called a synergy of sensations, which means she'll get out more than what's put in.
Her nipples, and by that I mean the central bits and not what surrounds them the areola, are such a special place both biologically and sexually that they should be treated with a high level of respect verging on reverence. Be gentle but positive with them for by now they will feel like they are a dam holding back a tide of such massive proportions of sensation that they could well feel ready to burst as the pressure intensifies. So any touch will be welcome from your fingers gently pinching and pulling to your tongue's caresses and to your teeth carefully biting before you use your piece de resistance, sucking your lover's nipples one by one as, at the same time your finger stimulates that wonder bud of flesh at the front of her vagina. Some claim that the enormous attraction of this to women is the recall of suckling their children there and to men of being that child!
Whatever you do, don't rush but take you time before recommencing your oral journey down her body. Kiss and lick her lower chest, maybe probe your tongue in her navel, lick all over her stomach and ease your mouth to nearly their destination. If she is unshaved you'll reach the hairline soon just above that beautiful pubic mound. It's a matter of choice for her whether she's bald down there or not and for you just what you do in her pubic hair if there is a goodly thatch? I'll leave that up to you.
Whatever you decide to do with the hairy patch, sooner or later you will reach 'heaven.' And not to put too fine a point on it and to use a redolent word, you'll reach her cunt. Now in the appropriate circumstances isn't that a wonderful word? And using it to insult someone by calling them a cunt as if it's something distasteful is certainly not appropriate. But telling your lover that she has a beautiful cunt is very appropriate, just like telling her that you want to love her cunt or make love to it can be. But be careful as many women do not like the harsh reality of the word and prefer the vanilla sounding pussy. Play it by ear!
