Miss Dula was working out at the gym when one man challenged her to an arm wrestling competition, and the loser was going to be the other's slave. She was quite taken aback as the man was busy bragging how he was going to make her his slave. Everyone gathered around them to witness what was going to happen. She agreed to the competition as she wanted to punish this man. She won against him and he was now her slave. To punish him, she commands him to undress before starting to kick him mercilessly without restraint.
Mistress Dula wanted this guy to know how to use a chastity device and that is why she opted to use it on the guy. He never tried to mess up with her because he knew that she would not let him get away with it. So he cooperated with her and he did what she expected of him. When he was done, the mistress let him go without any additional humiliation.