I am going to make it easy for myself and just copy/paste the Wikipedia text: "An inverted nipple is a condition where the nipple, instead of pointing outward, is retracted into the breast. In some cases, the nipple will be temporarily protruded if stimulated, but in others, the inversion remains regardless of stimulus." Now let's make it more interesting and see which busty models have inverted nipples (in most cases just one, sometimes both of them)
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