Mistress Phoenix had wanted to reward her slave for his hard work and besides the money, she wanted to give him something different. That is why she thought of giving him jerk off instructions. So she called him to her room and she gave him her jerk off instructions. He was surprised but he went along with it and he had a great time and even became addicted to jerking off.
Mistress Phoenix wanted to help this guy learn to entertain himself and that is why she made him pay for her jerk off instructions. The guy wanted to get those instructions and other things for free but she told him her time was not for free. So the guy paid for her instructions and that is how she taught him the best way to jerk off and even showed him how.