Hi guys, new to the board here. Sebbie, I know what video you are talking about. That guy's name is Daigo Kitazawa and he acts in at least one other video than the one you described.
Here's the
link to the video you described.
This is the other one in which he acts.
He has a beautiful bod and amazing control over it in both vids. I'm going to try your experiment sometime to see how long I can last (I'm guessing maybe a minute at most lol). Been meaning to buy a pair of low-cut, sexy Asian speedos for a while and now's the perfect excuse to do it!