How does Raxanne's species feed their babies? I guess they must be born ready to eat solid food. In that sense it's a bit interesting why she has breasts if they aren't used for anything useful. It would basically have to be due to sexual selection in the population genetics of her species. Only those females that had a swelling in the chest could breed, so over the generations the chest did grow to resemble human breasts, even though they can't be used for feeding babies. However, it would still be very hard to create nipples that way, so there are none. The other alternative is that her species used to be normal mammals, but for one reason or another, breastfeeding was replaced by other means of feeding the babies. Breasts themselves didn't then disappear, but the nipples did.