Thank you MrsBates93 for beta'ing
He marked the wall with a rock, scratching into it until he could visibly see an indent. He did this every morning to mark another day.
273 days passed until it was Harry's 2nd birthday. Sirius thought back to when he had first held his godson, he had been so small and fragile. He would never forget the first time Harry had cried whilst he had held him, he had panicked and handed him straight back to Lily who had quickly soothed and calmed him.
He wondered whether Harry would be walking and talking by now, saying "Dada," and "Mama." Would he be asking for the parents who had been taken away from him before he had gotten to know them, to remember them?
Sirius slumped against the wall and let the day pass, trying not to think anymore of the young boy.
Another 92 days passed, another 92 marks in the wall. It was the first anniversary of that tragic night at Godric's Hollow. Sirius thought back to the events that had taken place that night; from the argument he had had with Remus to discovering the wreckage the Potters' house had become and how he couldn't stop the tears that fell.
He wished that Remus would come and see him, if only so he could apologise for accusing him of being the spy and even more importantly, explain to him that he hadn't betrayed his friends, that it had been Peter all along.
He needed Remus to see him, he was the only one who could look into his eyes and know he was telling the truth. It wouldn't get him out of his cell and earn him his freedom, not without James to back it up, but at least Remus would know the truth, at least he would know that Sirius wasn't the one who had killed James and Lily.
But he knew the werewolf wouldn't come. He had hurt him during their argument and he knew from experience that Remus didn't forgive easily. But even though he knew that Remus wouldn't visit him, he still held on to that small bit of hope.
That small bit of hope was all he had. It was the hope and the knowledge of his own innocence that had kept him going, kept him sane during the last 365 days.
He had to hold onto it.