I need to clarify your use of tits. Do you mean breasts or nipples? The reason I ask is that tit originally came from the word for teat or nipple, but has evolved to include breast. So, you could have 2 breasts, one would have a single nipple and the other having a normal nipple plus a supernumerary nipple (polythelia). Given your specifications, I feel it is important to eliminate any linguistic uncertainty.