Answer:
I'm a small ring shaped fried cake, often with bavarian cream or fruit filling, and sometimes covered in icing and sprinkles.
I am always hungry, I must always be fed. The finger I lick will soon turn red.
You can't keep this until you have given it. What is it?
Brothers and sisters I have none but this man's father is my father's son. Who is the man?
Kids play it and Michelangelo sculpted with it.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.