Answer:
A precious fluid, thicker than water.
Do what he says and you'll be fine, don't and you lose the game.
I always follow my brother but you cannot see me, only him. You cannot hear him but you can hear me. What are we?
My first is equality; my second is inferiority; my whole is superiority.
Lovely and round, I shine with pale light, grown in the darkness, a lady's delight.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.