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On a real girl, probably the stomach. I like to feel it up a lot since it's so soft, especially around the belly button (I don't like to stick my fingers in it though...).
In hentai, probably the face. The expression can make or break a picture for me. If it looks like they're in pain or the face is poorly done, I really can't enjoy it as much. But if they're looking happy or a little seductive...