Book plot,
Two siblings, a big brother and a little sister. He's a few years older the her and she just turned 18. He has a group of friends, who is a big part of the clubbing scene. He's very social. She's been sheltered from it all, and never been a part of it, but know he's friends and see them when they come by their home.
The brother's best friend has always had a crush on the sister, but the other friends always told him not to mess with her. The brother doesn't know anything about it.
When the little sister is finally 18 and is aloud in the club's she goes with her friends. She's overwhelmed by it all and leave. That's when she meats the best friend. He brings her to a more quiet bar where they talk...