Boobs after breastfeeding...

Okay, I’m vain. I have great boobs. I’m bummed about the possibility of ruining them via breastfeeding. So my question is A. Did you see a permanent change in your breasts after breastfeeding and B. How did you take care of them? Any tricks that actually worked to prevent sag/emptiness? I know it’s worth it, but I’m allowed to value the beauty of my body and would love any tips you moms have! Thanks!