Lady Stefanie used her seductive skills to get her slave to wear a chastity device. He thought it was something naughty she wanted to make him do but it turned out she was having fun at his expense and at the same time punishing him for something he had done a few days prior to that. The mistress got him to wear it, hid the keys and turned him on for it to hurt him. She let him stay with it for a few days.