-1 JK Rowling owns it not me :P
It was funny how life could be such a complete bitch sometimes, and Sirius was not someone new to the whole idea of that. Listening to the screams of his mother downstairs, and the cat calls emitting from Regulus across the hall, it was to anyone's complete and utter surprise that Sirius just didn't kill himself right now. But no, he couldn't die not now. He had something to live for, yeah something to keep him going each and every day. Flopping onto his back Sirius couldn't help but grin, as the screams echoed in the Black mansion.
He was alive...there's one big thing that could cheer Sirius up, but no, it wasn't good enough. Being alive wasn't enough, because being alive was just a small part of a bigger whole in Sirius's life. No...there was more that was keeping Sirius going. It wasn't the fact that he had his messed up family, or that he wanted to see the sunset. It wasn't religion, or some messed up politics in the Ministry of Magic. It was his friends.
Yes his friends. James, Peter, Remus...they were always there for him even in his worse state. When Sirius would get pissed over the stupidest of things, they would forgive them even though his ways of apologizing weren't always the best to them. They've gone through everything together...and that had shown Sirius something in the end.
There was always tomorrow...There's always a chance that he can be with his friends, and hear their laughter. And that's what kept him going.