Sister Dee is interested in leaving her mark on Nyssa Nevers. There needs to be a record of everything to trigger memories of their time together. Every lash leaves a trail that is a clear symbol of the suffering. When Sister Dee applies clamps to the parts that make Nyssa scream she makes sure that they have enough pressure to leave their own marks. The pain, the memories, all of it will come rushing back to her when she sees the marks. It all comes back, along with the intense feeling of lust and desire. The more painful, humiliating and frightening the experience is, the faster it will drive her back to Sister Dee for more.