Mistress Isabella needed to calm this guy down and she chose to do it with her joi fetish. She teased the guy then she gave him jerk off instructions which he used to cum. He was shocked at what she did but it was a pleasant surprise for him as she was looking out for him and she wanted him to calm down. It actually helped him to calm down.
Mistress Isabella knew that her slave did not have a girlfriend and she knew he was also shy. She did not want him to suffer and she therefore taught him how to jerk off well. The mistress felt that it would be the best way for him as he would be in charge of his own satisfaction. The slave watched her do it and he loved it and even tried it as she watched.
Mistress Isabella Tasci loves to give jerk off instructions. That is because she loves to have fun at the expense of guys. She knows guys find her hot but she knows that she cannot mess with them. Making them jerk off to her instructions is the closest they can come to messing with her. Being a naughty mistress, she knows how to make it worth their while. But they also have to appreciate her.