Well, lots of Asian people are really skinny (because they don't devour tons of American fast food), so it's kind of hard for one to be skinny with big boobs (unless you get implants)
However, Fuko makes the exception !
How big is too big? I think many would agree that former sex worker Fuko, whose 120cm P-cup bust has launched her career as a gravure model, crosses the line into the realm of the freakish: