Love the details in your posts Screwhwr... I can put myself in your situation very easily... and what an awesum situation that is!!! I'm not sure if I'd rather be you, or Greg, the thrills are real from both sides. I THINK I love the stomach turning angst of watching the wife enjoying herself with with another man the most.... but I'm not sure.....
That angst can be very strong! Even without watching, just knowing he's fucking her, makes the heart pound. Makes breathing irregular. And makes my cock rock hard!!