Sometimes I like to place locks on my slaves hard nipples. The weight from locks is perfect addition to any good melon torture session. & of course I have key to locks. That alone turns me on. There is something symbolic about locking up my bottom's melons. melons are ultimate symbol of womanhood, & when I lock up sub's boobs, I am not only causing her excellent pain due to extreme weight of locks, I am also symbolically locking up her womanhoood & telling her, "Your femininity is in my hands." What feeling of power!