When my slaves get too naughty I bind their tits in leather and watch them squirm. I save my nipple clamp of pain for my extra naughty slaves. Whether I discipline them by hand or by machine, tormenting their tits is my favorite thing to do. I even love to just grasp one nipple in each hand and twist and tweak those nips as if I were unscrewing a jar…. only I squeeze real hard at the same time..