Answer:
What travels from house to house and is sometimes narrow and sometimes wide but always stays outside?
What binds two people yet touches only one?
What goes further the slower it goes?
What goes through the door without pinching itself? What sits on the stove without burning itself? What sits on the table and is not ashamed?
What is never used unless it's in a tight place?
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.