This could've been canon... it felt so real, somehow. I especially loved the part about Sirius being so fucked up by his parent's treatment that he hadn't ever experienced love, therefore thinks he couldn't love, and is so surprised at finding out his future-self is very well in love. Another thing I really loved was him indirectly saying "Am I really that bad?" This is a thing I imagine Sirius to be aware of... being aware of his personality, about this tendency of his to bollocks fuck things REALLY up.

Hell, I'd've loved to know how it'd go on for the young MWPP here. I do love your Sirius saying that maybe Peter's not going to turn out that way; maybe they'll include him more and be closer to him, thanks to Sirius' advise.

I just really like this.