Spike/Buffy/Tara fic

[fenchurche.livejournal.com]

I know I'm going to kick myself for not remembering who wrote this one, but I've been wanting to reread a fic that ended up being Spike/Buffy/Tara. It takes place during Season Six with Buffy and Spike involved in their secret relationship. Buffy and Tara getting hit by some sort of beam by the Nerd Trio that ends up melding their minds a bit... and then later, Spike gets dragged into it with them (leading to them being in a threesome relationship by the end of the fic). Ring any bells with anyone?