Evan will answer some more comments soon. In the meantime, here is a sequence of video stills close in time to perhaps the most downloaded picture on my blog: a sequence where Evan is spanked over my lap, and he squirms up, showing the world his partially erection. I like this sequence a lot, and I guess many of you do too. His penis and balls look so attractive like this!
In these pictures, you can see that I spank him while he is squirming, but this doesn't deter him, and he turns almost right over. As you can see, he is very large, so this actually hurts me a little when he does this, although I find it funny at the time. (If you could see my face, you would see that I am laughing as he squirms up towards me.) You can also see him yelling in pain from some hard spanks.
Towards the end, you can see me pushing his legs back down, so we can start again. But after he does this a few times, I would much rather use the bench, so that I can spank as I please without him rolling around on top of me.