The sub is bound to a pillar with both hands behind his back, unable to escape. He is subjected to electro shocks and CBT, and to add insult to injury he has a respiratory management mask put on to make breathing more difficult. During the electric shocks, he squirms, and while his dick is tormented he can do nothing but yell in pain. This torment is both punishment and reward, and you can see he enjoys it even though he is howling in pain.