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Disclaimer - I don't own Harry Potter.

    The original intent of the Upside Down Mirror series was to simply write a prequel for the original one-shot which was a story where Neville was the Boy-Who-Lived, which the other Upside Down Mirror piece definitely is, but it also turned unintentionally into a Regulus Lives project, but as I wrote the first chapter of the other one I got to thinking about Regulus asking for Sirius' help.

    The reason for this comes from the fact I'd gone back to reread a few scenes in the books when I wanted to double check a few details and read the part where Harry describes Regulus as being smaller than Sirius, but then I got to thinking that Regulus might actually have been small enough, but at age eighteen he wouldn't have reached his peak in muscle weight either. I also got to thinking of how Sirius's disdain towards Regulus might not have anything to do with Regulus himself, but the fact he blames his parents and himself for what happened to his younger brother.

    As for the autism headcanon, that occurred as I wrote the first chapter in that I realized the way I was writing Regulus, he did indeed have the traits of someone on the spectrum. It's not something which will be verbalized as this is a time when he wouldn't have been diagnosed, but to me it explains Regulus' behavior a lot.
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