"Well, that's a pretty big question, isn't it. Who am I. I'm Sirius Black, disowned and dishonored son of the Ancient and Most Noble House of Black. And good riddance to it. I'm..." he thought for a second, then snorted. "I'm James and Remus' friend, and even if you don't know them they still do a lot to define me. I'm an adrenaline junky who can't sit still and has a stupid answer for everything. I like boys, I like girls, I like loud music, I like drag queens, and I like pissing off authority figures. I tried my best to fight Voldemort, and failed. Oh! And I can turn into a dog."
He transformed into Padfoot, leaping around her for a moment, before changing back.
"There. That's a bit of who I am. Tit for tat, it's your turn now."
He couldn't imagine going to Hogwarts and not wanting to know every single secret it held. But he could admit that he was more likely to get obsessed about things than the average person.
"I hope it is too. We can go look, one of theee days. If you want. We're due to go scout out all the old manor houses at some point."
It was interesting, listening to her talk about Harry like that. It wasn't the baby James had known, or the tired man Sirius was beginning to know. His Harry sounded more like a legend than a person. He wondered how Harry felt about that.
"Well, you're right. I don't know him, not really. Not yet. I want to, he's James' son. But mostly he seems like a good person. I have a feeling we'll all get to know each other more than we ever expected when all is said and done. Especially considering we never would have met otherwise. Does Harry really have a son named James?"