the slave’s pain is her Owner’ pleasure. He is a sadist that enjoys torturing her. she knows that her suffering makes her useful and valuable for her Owner. she is trained to learn the beauty of her pain, and made understand how sweet that makes her Owner feel. she must learn to cherish it, and appreciate that her Owner makes sure she is put to good use. the slave’s temporary physical pain producing her Owner’s mental satisfaction: obviously her pain is a minor price to pay. she had no say in the matter, but she can be forced to appreciate it. she is constantly trained and habituated to inject this into her mind. slave is being perfected.