Up and down. Up and down. My zipper controls your cock stroking. When my zipper is up, you may stroke. When it is down and you can see my juicy cleavage, you must abstain from stroking. A maddening game and you stop and start the stroke cycle for me when I say, feeling the control I take from you in doing this. It wouldn't be as much fun to just plain cum today, that would be boring. This is much more exciting. I work you into a frenzy and promise a big orgasm finally at the end, when I unzip, show you my tits, and count you down to cumming...