Puberty hair growth...?

So, here's the dealio... I'm 15, 5'11", and going through puberty.... I have a girlfriend and she likes me but, she'd like a hairier me.... I do have some body hair, but it's very short. My leg hairs aren't that distinct (kinda dark and about 2cm long) and only cover the front of my legs. I have no arm hair, but some underarm hair. I'm getting some TINY and I mean tiny black hairs around my **** and navel. So, my question is, when will it all fill out?! I know the watched pot never boils, but it hasn't boiled since November of last year!!!! Help andadvice is mucho appreciatedo. Is there anything that'll make it grow faster? I just want what's best for me and her...