Say nice things. Fluff talk and teasing, compliments. But make sure you brush aside her hair with your fingers, whisper in her ear, caress her neck and shoulders, pull her into you gently but firmly -- 'when I dip/you dip/we dip' -- get the idea?
Make sure you're enjoying the moment and appreciating her body rather than trying to enact some tactic you learned off a web forum.
It doesn't really matter what you say my man. It's all delivery.