This was a great story, I'm surprised that this is only the second "Sirius manges to get Harry and raises him on the run" story I've seen. I hope you finish it. At first, I thought that your comment about the next update being in a couple years was a joke, but now I see you are serious. I hope that next year when you update, it's with ALL the remaining chapters, not just a one chapter update.
Till then, good luck and good writing.