Mistress Nyx had a horny slave and she noticed that he was distracted most of the time because he was horny. So she felt that the best thing to do to him was to make sure he got a release so that he could focus on other things. So she used her feet to rub his dick and balls a little then gave him jerk off instructions and he had a great orgasm.
This guy was an amateur and mistress Nyx wanted him to become good at what he sought to do which was to jerk off. He did not get along easily with girls and so he did not have a girlfriend. She had to get one but before he did, this mistress noticed him and she helped him relieve himself by cumming. But he had to jerk off to his methods and he loved it.
Mistress Nyx felt that this guy needed to be rewarded as he had done what she had asked him to do and done it marvelously. So she rewarded him with jerk off instructions. And to make it even better for him, the mistress undressed and she let him use her tattooed naked body to jerk off. He saw her sexy ass, big clit, her small tits and clean shaved pussy and he could not help but cum.
Mistress Nyx wanted to make this guy jerk off to her instructions. But the guy was not enthusiastic about it so she knew that the only way for her to do so was to force him. So she did not hold back and she had to make sure she forced him to do it. She told him if he did not do it, she would crush his balls and so he did it out of fear.