Dana is a quick study and was able to master the art of milking guys but I can tell that she gets excited to see them cum and she needs to work on her "edging" skills to prolong the pleasure.
I know this isn't that easy and when you're in the moment and a patient is climaxing you want to see him release.
She does a great job of talking her patient through the session while she milks out every drop of cum. I normally put this cockring around the shaft but Dana managed to get it around his cock and balls...great job Dana!