Answer:
Come up and let us go. Go down and here we stay
Stealthy as a shadow in the dead of night, cunning but affectionate if given a bite. Never owned but often loved. At my sport considered cruel, but that's because you never know me at all.
Something wholly unreal, yet seems real to I. Think my friend, tell me where does it lie?
What has a head, a tail, is brown, and has no legs?
What letter comes next: O T T F F S S ?
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.