Black Demon's Witness (Black butler fanfic)

"Do you wish to sign a deal with me?" The devilish voice asked me a question as I stood lonely in the dark. A black cloak was wrapped around me in the moment and underneath I was baring my brown skin. "Yes." I replied. The sudden voice began to laugh in amusement. "Signing your soul from the heavens and giving it to the demon child of the devil is what you want?" The voice asked. "Yes." I replied. "Well then. The black seal on my hand shall sign our contract." A dark shadowy hand reached out to me in lightning speed. "I shall place the seal on your beautiful skin!" The hand grabbed my leg and a burning sensation drilled its way into my body. "Ah!" I cried. The hand released me and a handsome man appeared before my eyes. "Now my dear, I am yours until you fulfill your goal." The man had shiny black hair, red eyes, sharp fangs and he wore a black tuxedo and shoes. "What is your name?" I asked. He laughed under his breath. "My last master called me...Sebastian. My lady, Give me an order."