The marauders all know Sirius black likes a girl. He calls her “Layla” after the Derek and the Dominos song because he doesn’t know her name. She’s the opposite of him. Just a happy little hippie. Just trotting around in her happy little whimsy bubble. Her name really is Ruby Rae but the marauders don’t know this. He yearns for her in silence for so long. This girl is Sirius’ muse. His Pattie Boyd is the only way to put it