Mistress Suzy likes attention. And that is what she demanded from her boyfriend. She felt that he was not giving her the attention she deserved. So the mistress strangled him to show him that the same way he needed oxygen to survive was the same way she needed his attention for their relationship to survive. He got the message and he made changes because he knew the consequences were not pretty.
Lady Sue had an issue with her slave. She cruelly tortured him to make him do what she wanted. She wanted him to learn to respect other people her being one of them. She used a rope to strangle him and made him beg for mercy. He was scared shitless and begged for mercy saying he had learned his lesson and would not repeat his mistake. She forgave him after the punishment.