The Escape
Sirius stared blankly at the wall of his cell. He sometimes forgot why he was in Azkaban in the first place. Unfortunately, those moments of forgetfulness never lasted long. Eventually he remembered. Two of his best friends were dead, another had betrayed them, and the last no doubt hated Sirius and thought he deserved to be in here.
Sirius blinked back tears. How could Peter have done this? They had loved him, he'd been like a brother to them, and yet- he was the reason Lily and James were dead. It was because of him that Harry was an orphan and Merlin knew where.
A sudden clang brought him out of his thoughts. A tray of food and a copy of the Daily Prophet were shoved into his cell. He shivered at the feeling of cold and hopelessness that signaled a dementor's presence.
He waited until it passed before going near the food. He didn't know how often they fed him, just that it wasn't enough.
He could only manage a couple bites before he felt sick. He glanced at the newspaper. He didn't really care what was going on in the outside world, it wouldn't really make a difference to him. He frowned at the date. In just over a month Harry would turn eleven. His rage at Peter came back. If it hadn't been for that damn rat he would be planning his godson's eleventh birthday party.
Sirius tore the paper to shreds. He transformed into Padfoot and howled in pain and anger at what he'd lost.
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Sirius woke the next morning still in Padfoot's form. He blinked. He felt much better than he had in years. A dementor went straight past his cell, which was odd. They never went straight by, they always stopped to torment him.
Tentatively, he moved closer to the door of his cell. He pushed it open with his nose. The doors in Azkaban weren't locked since the prisoners didn't want to get closer to the guards. The second a door opened dementors swarmed it and whoever was on the other side of it.
When Sirius opened his door two dementors shot towards it. However, they didn't touch him. They went into the cell and started looking for him. Sirius got out and ran for the edge of the island as fast as he could in case they figured out he was the dog.
He leapt into the ocean without a second thought and started swimming for shore.
He shook himself off when he got there and looked for a place to rest. He changed into a man briefly to cast a spell to find Harry. He snarled when he saw that Harry was with Lily's sister. He changed back into Padfoot and, after a short nap, started running again.
'Hold on, pup I'm coming.'