This chapter is so short it borders on ridiculous, but still. I like it. Let me know what you think!
Sirius knew, the moment he saw the picture of Peter perched on Ron's shoulder that he had to get out. Ron was going to Hogwarts and he would be bringing Peter along. Harry would be there as well and who knows what Peter was up to? Sirius had to get out, to protect Harry. Sirius couldn't let anything happen to him, not when he already let Peter get to James and Lily.
The Dementors noticed a change in his behavior, floating past more than normal. Sirius began turning into Padfoot more and more, trying to make it so the Dementors thought it was to be expected. Being Padfoot had other advantages as well. Padfoot's thoughts were simpler, less upsetting than Sirius' own and while Sirius was still present, the dog part of his brain was content with curling up in the corner and going to sleep, something Sirius could rarely do in his human form.
After a while, the Dementors went back to normal. Padfoot's presence was of little consequence to them. Sirius knew that now was the time to escape. He turned into Padfoot late one night and slipped through the bars, out of the prison, jumping into the water and swimming as fast as he could away from that godforsaken island that had been his cage.
He breathed in the salty air. Finally, he thought. He was free.
Let me know how you liked it?