Only A Dream

He'd always wondered why Peter had chosen to betray the Marauders to Voldemort. Curled up in his canine form, Sirius leans against the metal bars of his prison cell and falls asleep. And this time, what plagues him is not a nightmare, just a dream- in which he sees things his sub- conscious mind picked up once upon a time... but he was just too preoccupied to realize. One-shot.