So, something heartbreaking, but well worth the read, is
shadowscast 's fic from last year's
summer_of_giles It Never Happened (Giles/Spike R)
It's one of those stories set in the summer after Season 5, and has this wonderful thing happen with Spike and Giles, who are left to put the pieces back together. But something happens on the way to Spike that changes everything. And then changes it back again. It's pretty awesome fare as long as you're ok with a fierce yet wonderfully appropriate ending (and a great story in between).