[AbiDrew85]

I'm just kind of hoping I've finally got enough progesterone in my body for my breasts to start actually developing rather than just growing.

That is a key point to be made that I wish more girls would recognize...

While it takes estrogen to make breasts grow larger, it takes progesterone to develop most of the actual glandular tissue.

It takes BOTH, in appropriate balances at different times of the month to develop fully developed, large, gorgeous breasts. Or at least as large as your genetic disposition and eating habits allow, which are whole different topics entirely, though the eating habits do play into NBE as well, it's still a different topic from the hormonal aspect of NBE.

Of course, we're still missing one more key hormone: prolactin. It's not JUST for lactation, but also for developing the milk ducts in the first place. That's why there's a slight surge of this in early puberty that's almost as wicked as a pregnancy surge, and why the pregnancy surge also exists. The former so that a girl can start lactating at all, and the latter to give her milk a nice little kick before that baby starts sucking her dry.

Women in general have higher prolactin than men. And early puberty and late pregnancy see some mega surges of the hormone. Genetic girls may or may not need help with prolactin... I definitely do though.