Some of these you probably read. I've haven't read the last 2.
Running from the Inevitable by The Enemy of Reality
http://spikeluver.com/SpuffyRealm/viewstory.php?sid=36928&warning=NC-17Summary: With a tub of ice-cream in her lap, Buffy wallows in misery over Angel disappearing out of her life in a puff of overly dramatic smoke. Her life gets turned upside down when her hated enemy staggers drunk off his face to her front porch. Not only is he demanding her help, he is invading her personal space. She's had enough!
Christmas Rage by The Enemy of Reality
http://spikeluver.com/SpuffyRealm/viewstory.php?sid=37259Summary: The holidays were supposed to be a fun-filled time full of presents and overeating, but everything went down the drain when her mother decided to extend charity to a vampire. WIP Updated often.
A Chance in Hell by dampersandspoons
http://spikeluver.com/SpuffyRealm/viewstory.php?sid=30994Summary: Runner-up at the Cradle of Humanity Awards Round 2 for the Be My Mate Award. Runner-up at the Rogue Poet Awards Round 6 for Best Lighthearted. Runner Up at Spark and Burn Round 5 for Best WIP. An apocalypse threat in Maryland requires a vampire's help to disenchant a stone used in the ritual to destroy all of mankind. Since Angelus is still without his soul, Buffy is forced to ask the one vampire she hates for a hand. The problem is, he's in a wheelchair. What happens when a crippled vamp and a slayer make a cross-country trip to save the world? Will they kill each other before they get there, or will her horrible driving do the job for them? But what if they found solace in one another's company instead? Could it be? Yes, it most certainly could.
Superstar Revamped by Kantayra
http://www.nocturnal-light.net/fanfiction/story/351/Superstar_RevampedSummary: AU of the S4 episode 'Superstar'. With her friends brainwashed, Buffy must turn to an old enemy for help. However, soon she and Spike find themselves fighting a losing battle against the irresistible attraction between them.
Southern Comfort by Holly
http://www.nocturnal-light.net/fanfiction/story/421/Southern_ComfortSummary: A rampaging demon sends Buffy down south, where she finds help from a most unexpected source.
These maybe you haven't read.
Summer Nights by SpikesDeb
http://www.nocturnal-light.net/fanfiction/story/340/Summer_NightsSummary: Set after Graduation Day Part II. Buffy's spending the summer with her dad, and during a tussle with a demon she finds she's rescued a very familiar vampire. He's snarky and cocky, and strangely attractive - and the two of them find themselves in a situation they never expected. Written for a ficathon on LJ.
I think these sort of fit.
Harnessing Sunlight by Sandy S.
http://www.nocturnal-light.net/fanfiction/story/199/1/Harnessing_SunlightSummary: A few years post-NFA. The good guys did not prevail in the fight in L.A.
The Underground by Jypzrose
http://www.nocturnal-light.net/fanfiction/story/102/The_UndergroundSummary: Seven years after the end of Season six. Buffy and Dawn left Sunnydale after the tragedy. Spike never went back after he returned from Africa. Now Dawn has been kidnapped to force the former Slayer into participating in an annual tournament that pits demons and humans against each other. Will Spike answer the Slayers call for help? Of course, or there would be no story. But will they survive long enough to right the wrongs they'd done seven years before?
Riders by Winsomeone
http://www.nocturnal-light.net/fanfiction/story/405/RidersSummary: Buffy and Spike set off on the trail of a killer and wind up in alternate dimension 1870's Nevada trying to prevent the Four Horsemen of the Apocalypse from rising. 29 chapters/ Epilogue Complete
The Wonder-Worker by Winsomeone
http://www.nocturnal-light.net/fanfiction/story/388/The_Wonder-WorkerSummary: Reluctantly partnered with a certain bleached blond vampire, the Slayer searches for the missing Imperial Wizard of the White Wizard Council before her disappearance allows dark forces to open the Hellmouth. Increasingly embroiled in the serpentine plot, Buffy and Spike soon realize nothing is as it appears.