Lady dark angel has been given a new pair of boots by her slave and he's especially adapted the heel to make them really sharp. So obviously lady dark angel has to try them out on him. She gets him laying flat down while she walks on him. Full weight and digs the heels in really deep. She really wants to make her mark on her slave and keeps digging and digging. Twisting those heels into his bare flesh. Look at the results of his back after she has had a good go at making her mark.