This mistress was not as good in class as her classmate was and she wanted him to dedicate a little bit of his time to show her what she did not know. She partied a lot and that is why she wanted to make sure that she did not miss much. That is why she chose to use her jerk off instructions to make him agree to her deal as she did not want to fuck him.
Mistress Vanilla knows how to make people do what she wants. Today she was out to make this guy cum using her jerk off instructions. So the mistress went out of her way to make them as naughty as possible for him to not only be turned on as quickly as possible, but also to cum as quickly as he could. And it all happened as he did what she asked.