Sirius Black, I mean Cara

I have been reading meta about genderswap fiction. and I'd like to read about a Sirius who has never not been a girl. But I dunno that I'd like her, or (if I wrote her) be able to keep her separate from Bellatrix or (my version of) Walburga. Anyway.

Name: Cara Astra Black. (Cara is a star in the Orion constellaion, Astra just means star)
Date of Birth: 09.04.1960
Parents: Orion Black. Waburga Black.
Siblings(s): Regulus Arcturus Black.
Height: 5ft 9inches (I think of Sirius as 6ft 1inch, so this is close enough)
Hair: Black.
Eyes: Grey.

( Cara is basically Claudia Black, and as I use Hugh Jackman as (one of) my Sirius visualisation )

the resemblance shouldn't be too hard to grok.

I picked Sirius because, apart from the fact that he's my favourite character, hands-down, it's not a story that gender seems to affect, at least much, y'know? But it would, of course, simply because Cara's a girl, and girls are brought up differently. It also changes certain things ( at least as-seen-from-the-outside) into straight-forward love stories, which they aren't if it's Sirius, even if/when I slash him.