She seems to be edging him - getting him close to cumming and then either using the pinch/press technique to back him off or moving to a different area and then working him up again. Getting close and riding those waves is supposed to intensify the result. I think that's a Tantra technique.
Ran across this clip http://xhamster.com/movies/1309574/the_best_cock_massage.html and would be interested if there are any FBSM providers (or escorts who like to do massage) that could provide this depth of service. This girl obviously knows exactly what she is doing. A bunch of edge play, full workout and lingam massage, perineal massage, everything except prostate massage, which I would also like included. It's a long video, sorry. Greensboro/Winston area.
What a lucky cod that guy is! I'd be happy to meet her anytime!