Well the title kind of says it all:) I'm 14 and have B's. Is there anything I can do to help me grow into at least a C? I'm not going to do anything drastic like take pills or have boob jobs or anythiing like that, I just want to know if there is any natural ways of making them bigger? Any advice would be helpful?

You will have to be patient as time is the only thing that will work.
You are still growing.

In college as a senior, I had three roommates, all good friends. Amazingly, we all were 34B and decided that is the perfect size. No sagging later in life, and looks good in any kind of clothing.

And why do you want Cs? Bs make for a more symmetrical appearance. As you get larger there may be more sag, posture issues etc.