For me personally, nipple punishment is probably the most nice thing that I sometimes practice, as it simply with some nipple clamps hurts like hell. Sometimes your nipples can even turn into wounds a couple of days after the punishment, in case the Mistress has been really cruel. I don't know how slave Peters's nipples looked the day after his visit to Miss L and Mistress Hazel but I can see on his face during the session that it was a great experience. Learn from the two wonderful UK Mistresses Mistress Hazel and Miss L how nipple punishment should be done.