Here are a few I like best from S5:
This is one of my favorites from Season 5. Unfortunately, it is a permanent WIP,
BUT it ends in a great place that won't make you mad!
Just a Fling by
MadRogSummary: Dracula has woken up the slayer's dark, sensual side, and she decides to explore that side of sex for herself. Who better than to help her? Spike of course. This is a fun, sexy romp of 5th season Spike and Buffy. Evilawyer calls it PW1/2P. Bloodplay.
Blood Warms The Heart by
TaniTKD
What would happen if Buffy reacted differently when Spike flashed his game face during Fool For love? Bad Buffy!
This one is a WIP on Elysian Fields, but
IS being regularly updated:
I'm With You by
wolffan200Summary: Set in season five at the end of Fool For Love. It fills in the blanks of what might have happened when we were left with Spike and Buffy sitting together and then develops into a longer story. Starts out canon and goes AU. Buffy's Mom is sick but won't die and a few things are going to change because it is my story and I'm going to do things different to Joss although they will start out similarly.
Not Beneath Me by
TashaBegins at the end of the episode "Fool For Love" (Season 5). What if Buffy hadn't kept completely silent when Spike sat down next to her? What if she had asked him to stay and opened up to him, even a little?