My 23rd Challenge

This challenge comes from sandy. The number this time was 13. My Mistress told me to go as slow as possible. Working as slow as I could go; I was able to complete the first 4 edges in one hour, with about 15 minutes apart on the edges. I completed another 5 edges in the second hour, with about 10 minutes apart on the edges. I then completed the remaining 4 edges with-in about 40 minutes, with about 10 minutes between edges. I was able to completely keep my concentration the whole time I was completing this challenge. I was ready each and every edge to hold myself from cumming. I was getting a little tired by the end of this challenge; however, I was ablet to mustard up enough energy to keep myself from cumming. Just writing about this challenge is making me tired.