There are many fanfictions I love, but since I’m lazy, I’ll just pick a few, that I found particularly good :
Summary: Post Slayer, Interrupted (9x05), Buffy has a decision to make.
Buffy & Spike in the first issue of season 9.
Summary: "Can you tell me, is this love that I’m seeing?" One by one, the people in Buffy and Spike’s lives try to add up the obvious.