Mistress Gaia is one of those people who punish others depending on what they have done. She does not like to punish people in the same way for all kinds of crimes or mistakes. Like today her slave stole from her and she used her teeth to bite his fingers as punishment. She wanted him to feel the pain of it and that would deter him from ever stealing again.
Lady Kara loves biting people. She had however never been bitten before and she wanted to experience it. So she chose to bite herself as opposed to having someone else bite her. She could not believe how painful it was and she had to stop midway because of the intense way she bit herself. That was when she realized that it was a cruel and crazy punishment she liked to use.