A mistress I met has a thing for finding a slave who can go through a session with a full erection. I usually start every session with an erection, and humiliation gets me really hard, but after certain amount of pain, my dick goes limp. I have a very small dick, so she tells me that should make it easier for me to keep my hard on, but I don't know about that. I keep trying, but I just can't imagine that I could keep an erection while crying and begging for mercy as I'm bullwhipped. Also, it doesn't help I was kicked in the balls repeatedly by a former mistress every time I got an erection in her prescence. How can I keep an erection while this one kicks me? The obvious answer is viagra, but she wants me to actually keep it naturally. Any ideas? Is this even possible?