The act of biting someones chest seems awkward. The shoulder I can see, but the chest seems odd.
No experience with biters myself but my buddy had a girl that would tear the shit out of him with tooth and nail! She was nuts. He was always sore and torn up. His back still has scars. Then she got all knocked up and now he has a kid with her and she is in the words of the mighty Frank Reynolds, "A dirty Whooore".