Answer:
Send poorly behaved children to me and let them sit here.
As I went over London Bridge I met my sister Jenny; I broke her neck and drank her blood and left her standing empty.
With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?
I go up and never come down no matter how hard you wish. As I get higher more wrinkles crawl onto your face.
I can be any color you can imagine. You see me in everyday life. Look around, you can probably see some of me right now. What am I?
Give it food and it will live, give it water and it will die.