The slave must stay in the middle of the rug, laying with his belly on a white block, while Mistress Amanda is tormenting his anus with her pelvic thrusts and a huge strapon. He tries his best not to move forward or backward, because he knows, Amanda is going to be really mad if he does so. But the pain is extreme and his body twitches and spasms on it's own, so Amanda has to be even harder with him.