Hi there! So I need advice. I have rather large breasts for my size and they have always been big (5'3" & 90 lbs but a 32DD).
Any tips on how to make my nipples more sensitive? :-\
5'3", 90 pounds and 32DD doesn't sound like a naturally occurring proportion. Don't take this the wrong way, but you sound malnourished or like you have anorexia nervosa. Are your breasts so big because you have breast implants?? If so, they are the likely reason your nipples aren't so sensitive anymore and you may not re-gain your original sensitivity.
If you anticipate breast feeding, piercing your nipples is not the best idea. Also, nipple pumps will not give you more sensation because in time, if you pump a lot, you will grow more tissue in the nipples, which will cause you to have more tissue to stimulate but still the same number of nerves innervating the area.
It sounds like you might need a visit to a neurologist of a plastic surgeon. It sounds doubtful that you can change the sensitivity of your nipples.