Goddess Lena did not want someone who was a bad kisser. If he was a bad kisser, it meant that he would also be a poor lover. She did not want a bad sex life and so she had to punish the guy so that he would go and improve on his performance then look for her as she did not want to be his training ground. He went and came back a pro.
Lady Aurora is turned on by pain and she wanted a man who knew how to deal with and to handle pain. That is why she had to test this new guy. She whipped him after she had tied him up and stripped him naked. He handled it better than she had thought he would and he was rewarded with some hot, naughty and steamy sex from the turned on mistress.
This mistress does not have time for irresponsible people. When she realized that she was dealing with an irresponsible slave, she knew that it was up to her to make him change. So she stripped him naked and she forced him to lie down after which she caned him painfully on his naked butt. He tried to beg her for mercy but she ignored him and continued to punish him.
Lady Marie did not like how this slave was always doing things she did not like. And because she did not punish him, he took advantage of it and he did thinks she did not like. That is how and why she chose to use her cane to punish him. It was painful as she caned him while he was naked. But he learned his lesson and never did it again.