Lady Rockabella loved to hypnotize her boyfriend because she wanted to make sure that she was always aware of what went on in his life. She did not want to live with him blindly. But she was careful to confine herself to the major decisions and not follow every little thing that he did. The mistress made sure that she knew what he thought about things that he did not know that she knew.
Lady Rockabella is a control freak and she loves to have control over everyone and everything. She felt that she needed more control over this guy and so she came up with a plan of how to get it. And she got it by teasing him and getting him to lower his guard. The mistress hypnotized him and she brainfucked him to the point where she controlled everything about him.