Fine lines & Fault Lines: A Harry Styles Fanfic

Elowen Tomlinson and Louis Tomlinson are siblings, with their differences, of course. They are left at their parents' beachhouse over the summer while their parents travel Europe to live it up! Elowen, also known as Ellie or Winnie, is sweet and simple; she's an innocent girl and obviously the favourite child. Louis is the famous rebelling son, "drugs, sex, rock and roll baby!"
It's a summer of partying, messy romances and Harry Styles.
Harry and Elowen don't get along, with him being Louis's best friend; he treats her with disdain, just as Louis sometimes does. But is this out of real hate or protecting their feelings?
Harry is a 'screw up', but just how much of a screw up is he really?
Is he worth it? Is it all worth it?
The summer reveals all