A little darker than what I usually post

I am the part of the bird that is not in the sky,
who can drown in the ocean and yet remain dry.
A last vestige of Man that refuses to die.
In mourning I am tossed at your feet to lie;
I begin my Job early, devouring your ankles and thighs.
I Work my way up, eating your legs to your waist.
And though around midday away I am chased,
I return quickly to savor the arm of my taste.
As evening Falls I enter your lungs,
spiraling Down past your mouth and your tongue.
I feast on your body, your soul, and your mind,
but as darkness falls you shall find
that away I will go, a relief for some;
At least until tomorrow morning comes.