1. Lucifer comes to Buffy post resurrection. He needs a body. Buffy becomes a willing host. The tone is not sad little girl, but more revenge/retribution and a desire to see the world burn. When Lucifer catches up with Castiel and the boys Castiel recognizes the Buffy Suit prefight and responds with some utterance of despair. It's implied that the War has just been won though there is no on screen fighting. If the whole story is more that 5000 words, I'd be very surprised.

2. The boys (and John, maybe) investigate a potential weirdness in a town called Sunnydale, at least one of them snags a job with the local post office as part of their cover. They encounter various Vampires, Demons, and Scoobies. Especially Anya, or Miss Jenkins, as she's usually referred to in story. None of this really matters because the main character POV is the mailman. One day, in the life of a Mailman, on the Hellmouth, while he breaks in yet another new recruit. This story was long. I think at least 20,000 words.

I think both of these are one-shots. I also think that both of them are more than 2 years old.