Gently pull the pussy lips away and flick your tongue against the clit, hood covered or not. Do this quickly. This should cause her legs to shudder. When you sense she's getting up there toward orgasm, make your lips into an O and take the clit into your mouth. Start to suck gently and watch your lady's face for her reaction. If she can handle it, begin to suck harder. If she digs it, suck even harder. Go with her. If she lifts her pelvis into the air with the tension of her rising orgasm, move with her, don't fight her. Hang on, and keep your hot mouth on her clit. Don't let go. That's what she'll be saying too: 'Don't stop. Don't ever stop!'