There's a meta in a Buffy essay book about sisterhood and being a potential in Buffy Meets the Academy (I think that's what it is, but a lot of the scholarly Buffy books run together in my brain), and I know angearia has something on Buffy and Willow as the parents of the slayers somewhere (it's comics-compliant though, as I recall, so it may not be your bag). But Buffy=mother of the Slayers needs to be explored in fic.

I'll be right back - plot bunny happening.