Buffy gone wild?

I was just reading One by squawks, where Buffy is all innocent and in love with Spike, who's full of mixed signals and treating her like a little girl in the light of day. I loved it, but it being unfinished made me want to read something where she decides to grow up and show him what he was missing.

Maybe a fic where Buffy gets pissed and decides to turn into a female version of Spike? Maybe with a transformation a la Sandy in Grease? But not quite that cheesy.

I'm basically looking for Buffy trying to show Spike she's not innocent. I read a fic, can't remember which at the moment, with Buffy becoming like Ripper temporarily because of a spell. Something like that, minus the spell. I love all the AUs I've read where Buffy is the vamp, and Spike is the slayer. I want to see Buffy being the Big Bad. Can be human AU, or not.

So anything you can think of along these lines! Thanks!

Just wanted to mention the Buffy being like Ripper because of a spell is Love Like Fire by: Addie Logan. I got such a huge kick out of reading that one.

Also along those lines is Need, also by Addie Logan where Buffy is the one to seduce shy William.

Corruption by: dampersandspoons features a very bad girl Buffy who pursues and seduces Father William, her English teacher at her Catholic boarding school.

I'm trying to think of some other ones where she's innocent to begin with, but these are the only ones that came to mind. Hopefully, someone else will think of some fics to fit this description.

Thanks! I've definitely read Need a few times before. I think I also might have read Corruption, but I can't remember details, so it seems to be time for a reread.

Thanks for the link to Love like Fire also, which might also be ready for another read through.