I like to imagine the reader (who is best friends with the jocks + Alex) has their own place. Like their emancipated or their parents are never there or something. But obviously they'd be there all the time. Justin practically (or literally) lives there. They all go there when they need a break, or to smoke, because they don't have to worry about Zach or Monty's family coming home early. Or they go there to hang out instead of Bryce's because they obviously don't want the reader near him.