Graves was a demon, you were an angel. The two of you had met for the first time in the garden of eden, he was tempting Eve to bite the apple while you were meant to be preventing temptation. The two of you were Heaven and Hell's represatives on Earth, reporting back when miracles or temptations were done.

It was currently 2024, you'd know eachother since the beginning of time and often worked together on little things like him doing a quick miracle for you when needed.