I have my slave fixed to the cross with his hands tied with no means of protection and or escape, so I see this as the perfect opportunity to walk all over his back with my booted heels. I like to tread very carefully and slowly ensuring the piercing pain from each step is felt right though my heels deep into his bare back. Also just for my own personal pleasure I like to poke my heels deep into the tiny little bones in his hands while his wrists are tied just to see the pain on his face which pleases me..