Here are all the facts, experiences, techniques and media/links we have on:

Post Orgasmic Torture

With contributions by Sophie. - Thanks!

Continuing stimulation to the head of the penis after orgasm. The pleasure can soon become so intense that it becomes painfully sensitive.

A Milovanian Video Recommendation

NOT WORK/FAMILY SAFE: There's a video at http://www.xvideos.com/video37315/strokella_handjob_from_realtickling_com. He cums at about 11:35, everything thereafter is POT