Summary: When I was a kid, life sucked. It didn't get much better, really, but before Hogwarts was the worst. Then after Hogwarts, it sucked again. I know everyone complains that their childhood was bad, but mine really was.
And this is the story of why.
Sirius' P.O.V.
When I was a kid, I hated everything. I spent all my time trying to wind up my parents, and then keep out of there way when they wanted to kill me. I hung out with my brother Regulus, but he was always a bit odd.
I remember having family reunions. Everyone would come, and all us kids were expected to play together. Bella would think of complicated games that always starred me as the victim. Reg was her second-in-command. Only Andy looked a bit sad for me, but she never said anything.
It got even worse when Bella went to Hogwarts. She had a wand, and she made the most of it. Her favourite game was 'Tag', in which I had to run away, and be found. Reg, Bella, Andy, and Cissy would find my hiding spot pretty quickly. Then Bella and Cissy showed off all the magic they'd been learning – 'Crucio' became a quick favourite for Bella, whereas Cissy always liked the Bat-Bogey Hex. And our stupid parents didn't know a thing about it. They believed the lies that I'd tripped, or something equally as stupid.
This didn't stop for years. Auntie Druella and Mum always had lots to gossip about, and Reg always wanted Andy round to play. So yes, I grew up angry all the time. Can you blame me? And yes, my parents yelled at me a lot. How dare I hit Bella? Why would I pull Cissy's hair? Reg's only little, why did I push him?
Merlin, I hated them. I hated them so much. My parents, my Auntie and Uncle, my cousins. When I was three I vowed to get revenge. I did a special ceremony with a Muggle from the village – no one knew I could get to the village, obviously – and he made me swear on his Bible.
Sirius Black never breaks a promise.