I strongly disagree with some of the comments above. Teenagers have their hormones going nuts at your ages and the word "love" doesnt exist for most of you. Saying "if you love her, do it" is not something you say to a 14 or 17 year old. :rolleyes: Yes, its possible to love at that age but usually its lust, not love. :p
First of all, 14 is still very young. 14 and 17, although only 3 years apart, is still a very big difference at your ages. A lot changes from 14 to 18 physically and mentally. You're still growing up, going through school and experiencing a lot of new aspects to life.
Sex itself is a big deal and comes into play in a relationship. The law, as said above, can get you into a lot of trouble here.
I wouldnt be surprised if your friend become very disappointed in you for wanting to ask her out. I have a little sister myself (11 years younger then me) and at 14, I sure wouldnt want some guy (any guy) touching her. Older brothers are very protective of their sisters.
If I was you, I would wait until she hits at least 17 before thinking about asking her out. Stay good friends for now, thats my advice. Otherwise you risk losing your friend, losing a girl you like and getting in big trouble with parents and police. :cool:
Find someone your own age if you want to date. Its a lot safer. :)