Post Series Slayer School (in Iowa?) Fic

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Spike has been shanshued, but has no memory of his demon days, though he retains his "knowledge base", if that makes sense. The Council has employed him as a teacher of demonology at the new Slayer School, where he terrorizes the baby Slayers whenever they let him teach English Lit. Willow is the headmistress, I believe. Buffy comes to town, after years on the road, takes over for another teacher out on disability, and they start a working relationship, complete with forays into the field with a guard llama! The llama becomes a running gag, naturally. It all ends Spuffily ever after (or does it? tbc) , but I can't remember the title or author, naturally. Anybody have a lead?