Use the backside of your tongue
The softer underside of your tongue is perfect tool for stroking his frenulum - the super sensitive ridge that runs from the head of his penis down the centre of the shaft. Getting the right angle here is crucial and, lucky for you, this works best in the classic 69 position. Once you're ready to go, grip the base of his penis with one hand and run the underside of your tongue along his shaft from base to tip.
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