Breasts after nursing/delivery

Holly
Calling all mamas who have nursed their little ones!
Im planning to nurse my baby, I'm 12 weeks now.
My breasts have always been my favorite thing about my body. I wear a 32D now, I'm 27, they are still relatively firm and perky. They are however growing fast with this pregnancy.
I want to know the real deal from moms - does nursing change your breasts dramatically? Any way to avoid it or help it? Not gonna make a difference whether I do it or not. :)
Thanks in advance!