I'm 14. I have a D-cup. Is there any way to make my breasts naturally larger? I am quite slim and i want to stay that way.
Lol, you want to make D's bigger? On a report card, a D sucks (unless you're in Australia because it means Distinction), on a woman a D-cup is great! Any bigger and you'd probably be seen as less attractive.
There are no natural ways. Only "natural" way is to gain weight. Anyways, why? Many girls would kill to have a D-cup. You are plenty big enough already, dear.
Naturally breasts keep growing until a certain age which you have yet exceeded so let the time do its thing. (note from me, D-cup is big for your age)
Gain weight, get pregnant or get surgery. Those are the only ways I'm afraid.