The top in this video is like the monster in the first couple of seasons of Lost inasmuch as you never really see him, but he totally wrecks whatever he touches. In this case, that'd be this lucky bottom's ass.
Now, chances are that, just like the Lost monster, our top could also turn out to be the pornographic equivalent of some lame CGI effect: i.e. someone who's just not that hot. So we really don't mind that he's not in the picture. Watching this other dude moan and writhe in pleasure is more than enough for us.