This mistress knows that her slaves rarely get to satisfy their sexual urges because they are losers but also because they do not have to go out and look for mates. So she likes to use that to humiliate them. She is very sexy and knows that they can never get a girl like her. She then goes ahead to make them watch her put on a sexy show and touch herself in front of them. It is torture for them.
This mistress likes to humiliate her slaves. And when she does it, she does it in the worst way possible. She forced this slave to undress because she wanted to test his prostate. But she just wanted to take the chance to humiliate him and insert things in his ass. She taunted him and made fun of him before she was able to do what she wanted. And it was freaking painful for him.