"Well, breasts are used by female mammals to feed their young in the form of breast-milk, which is filled with the nutrients that a mammalian baby needs to grow healthy until they're old enough to not need breast-milk anymore.  Not only that, but they're good to use when pleasuring a woman," Nova explained as his hands stopped pinching Zaana's nipples, only to bring his mouth to her right nipple and beginning to suckle lightly.