The Marauder's Code

"Not only was Sirius encroaching on her personal space, but he was very obviously breaking the single set of rules that he and his band of misfits actually seemed to follow: The Marauder's Code. Honestly, wasn't refraining from putting your hands all over your best mate's girlfriend at the top of the list?" or Sirius gets too close for comfort and Lily is incredibly confused by it.