Neil asked:
How badly do you want Cally to have Avon's love-child?
Not at all--I don't think either would be a very good parent and it's not a good environment for bringing up children.
Though making the Auronar a separate species wouldn't rule out the possibility, just make it likely that any progeny were sterile.
Why does fanfic so frequently refer to the 'Auronae' when Cally quite clearly says 'Auronar' in Time Squad?
To the best of my knowledge, "Auronar" is a plural noun, "auronae" (like "sapiens" in a species name) is an adjective.
-(Y)