You would LOVE to watch me fuck my ass, wouldn't you? I know that you are an absolute ass-addict who will do anything to see me play with my tight, little butthole. I'll make you a deal, then: I'll play with my ass for you, if you play with your ass for me. I want to watch you stroke your cock while you stimulate your prostate. Don't worry, I'll make sure to walk you through it, giving you instructions as to how to pace your strokes and how to milk your prostate. How long can you hold out for? Will you be able to stoke through watching me cum? Or, will you let loose your nut when I orgasm only to have me instruct you to try for another one?
Grab your cock and let's see how you fare.