Answer:
What lies in a tunnel of darkness. That can only attack when pulled back?
Snake coiled round and round. Snake deep below the ground. Snake that's never had a head. Snake that binds but not with dread.
It regulates our daily movements, but it feels no interest in our lives. It directs us when to come and go, but does not care if we pay attention. What is it?
Late afternoons I often bathe. I'll soak in water piping hot. My essence goes through. My see through clothes. Used up am I - I've gone to pot.
My first master has four legs, my second master has two. My first I serve in life, my second I serve in death. Tough I am, yet soft beside. Against ladies cheeks I often reside.
The warmer I am the fresher I am.