I am your butterfly Satan

I will fly to you in your nightmares. Not on the wings of a ghost, but with my own wings as I really am. I am not a creature of beauty and love, and my metamorphosis was not from a caterpillar. It was from a demon. A demon became a butterfly in Hell to travel to you as you cry, and my presence means more tears will be shed. It is a bad omen. I am not a butterfly you wish to see. You will close your eyes so you don't have to look at the unpleasant sight, but I will still land on your shoulder to show you I am inescapable.