Tilt your head to the left or right (whichever is more comfortable), and press your ear against her thigh. Then lick from a lower corner point of the clitoral region up to its diagonal opposite, brushing against the clitoral head in the process. When this is executed correctly, you’ll notice that your strokes slow down because you’re working harder for each one and you’re using the side of your tongue as opposed to the front of it.