When mistress Zephy realized that she had a slave who did not do much of what she asked him, she changed tact and she made things go financial. Whenever he made a mistake, she financially dominated him. And in no time, he was completely broke and that is how he learned to change and follow her instructions. She made him lick her feet and do humiliating things because when he last messed and he did not have money, she had to humiliate him.
This mistress felt that she paid her landlord a lot of money and she wanted a piece of it. She knew he had many tenants and hence made some good money every month. And that is how she chose to tease and flirt with him in an effort to control him and once she had established the control, she used it to dominate him financially and she got a piece of the pie.
Goddess Lena wanted to try things she had not tried in a long time and that is why she chose to use money slave to do it. She had a score to settle with this guy and so she used that chance to punish the guy by turning him into her financial slave. And she used the money she got from him to try the things she had wanted to try.