sit next to her, put your arm around her, say "i like you a lot", then kiss her, then put your hand down her pants, rub her pussy, and stroke her hair with your other hand

From the South perhaps?

Jerry Christ! You got to find someone outside the family boy! And no, the family pig does not count as someone "outside the family"....

Well first start doing things with her in private, not sexual things, just do stuff together away from home or parents. ;) Then eventually she'll start becoming more comfortable with you. Now is when you can start talking about personal problems and problems with "fake GF".
Say some thing, like you are scared of what the first time will be like and you don't want to mess up on the first time. Ask advice about the female body or something, Like does it feel wierd when this happens or what not. And say stuff like I wish i was just prepared before my first time with some one i barely know. then eventually you can progress to eating her out and saying how it really helped you out and then BAMF you got her. I did it with my step sister. I said like I just wanted to know what it is like before I get into. We were up late one night and she was talking about a guy she liked and she wanted to know what it felt to have some one elses finger in her, so I told her that I was always there to help her out, and she asked me to finger and eat her out. So I did.

that is a really good story, good advice too, i'll have to try that on my sister