You should constantly push the limits of your slaves. This makes them stronger and better slaves. Like this cunt, she is having her pain thresholds tested. She has no control over how hard or how long, she has no choice but to try to take it with a little dignity. Eventually she will drip from her hole at the thought of being whipped or flogged. The more you uncover of her hidden desires the more she is yours. You make a woman feel helpless but cared for at the same time and she will be yours forever to mold as you see fit.