Khyleri - God... what are these for?

Technically correct, as Humans (I know she's actually an Angel, but bear with me here) are the only mammals whose females develop permanently enlarged breasts before pregnancy as opposed to being flat-chested all the time outside of pregnancy and nursing infants, implying that Human breasts evolved to become a display trait for the purpose of sexual selection, similar to a Peacock's elaborate coloring and tail, or a dominant male Orangutan's flanges and throat pouches.

To make you even cuter.