Subdogonly and the TBIP
Subdogonly is kind of a perfect pain sponge. As often as not, the more it hurts the harder his fairly large penis gets. That's a gift to a sadist, of course. He's also very smart, though. And his master is a lucky son-of-a-gun. This video isn't as instructional as some of the TBIP videos, but the TBIP is fairly ideal.