For me personally nipple is probably the most painful 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, in case the Mistress has been really cruel. I dont know how slave Peters 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 painful experience. Learn by the two wonderful UK Mistresses Mistress Hazel and Miss L how nipple should be done.