Mistress Van Licks and lady BlackDiamoond felt pity for this guy because he did not get a lot of female attention. He needed to get a release and so the mistresses decided to help him although they were not going to sleep with him. Instead of sleeping with them, the mistresses chose to teach him how to jerk off by giving him jerk off instructions. To make it easier for him, they even gave him handjobs and showed him their tits.
Lady Sue was interested in humiliating her ex because he of no use to her. He loved to be around her even after the breakup and he was looking to get back together. So she took that chance to have fun at his expense and this was by making him jerk off to her instructions. The mistress even recorded what he did and how humiliating it was for the guy.