Okay, I'll just do the rest now, get it out of the way
Coming Through by hulettwyo - Picks up from when Buffy beat the crap out of Spike outside the police station in Dead Things, then goes seriously AU.
Darkening of the Light by Addie Logan - Finding herself in what was once her worst nightmare, Slayer turned vampire Buffy Summers wants revenge on the one who made her. However, when she makes an unlikely ally in the process, she finds herself on a journey that changes her understandings of good and evil, love and hate.
Do Us Part by coalitiongirl - During "Graduation," Angel claims Buffy. All is well until a newly chipped Spike ends up on their doorstep, and their ties to each other and to him are all challenged, even the claim itself...
Dreams and Desotos by Bloodshedbaby - An alternate end to
Becoming where Spike and Buffy leave Sunnydale together and wind up in a small New England town where nobody knows their secret identities. But the past has a way of finding them when they least expect it.
Fin Amour by Angearia - The monks' spell to create the Key goes wonky.
Fixing The Factors by ImmortallySpuffy - Spells and Jealousy and Treachery...oh my! Set during The Yoko Factor, something has happened to make Buffy and Spike repeat the same day over and over. Will they figure out they're in this together or keep working against each other? Will they be able to fix the time loop or are they doomed to repeat the day for eternity? And just how many visits from a jealous Riley and Angel will Buffy be able to stand?
Found by CupcakeCute - Begins between TGIQ and Power Play, continues post-NFA. Buffy learns of Spike's resurrection from an unlikely source and immediately sets out to make things right as The Apocalypse breaks out in L.A. Spike/Buffy pairing, some Angel/Cordelia.
Fractured Fairy Tales, Part I by PaganBaby - Buffy and Spike are transported into a book of fairy tales in order to rescue Dawn, who had been drawn into it by magickal means. They'll have to work their way through various stories, taking on the personas of characters and seeing familiar faces along the way, to find Buffy's sister and bring her back home.
Her Way by dreamweaver - After Spike burns up in the Hellmouth, Buffy demands that the Oracles send her back in time.
Here Is Gone by Terri Botta - Spike gets a chance to do a few things over again.
His Way by dreamweaver - After 'Not Fade Away' Spike finds himself resurrected yet again and sent back in time by the PTB to fix things for Buffy.
Hunger by Sunalso - AU. Spike killed his third Slayer, but Dru was already dust. He's been lost, but when his supper turns out to be more than he bargained for, it leaves him hungry for something else instead. And Buffy? She's just hungry.
In Harm's Way by dawnofme - Season four story starting with a re-write of "Harsh Light of Day". Harmony is fed up with Spike's obsession over the Slayer. With the help of another vampire, Harmony casts a spell that will change the course of events and does exactly the opposite of what Harmony was hoping for. Spells, the Initiative and other problems plague our heroes as they fight an attraction that can't be denied.
In the Midnight Light by Holly - A brokenhearted vampire discovers that the truly important things in life often come from surprising places, and even more surprising people. Suddenly, Spike finds himself in a crisis of faith—the better angels of his conscience battling the restraint of his demon, all for the love of a girl he shouldn’t want. A girl he’s drawn to, even beyond his own reckoning.
Keeper of the Truth by Trisha - "There's always consequences." Spike is proven right when Willow's spell brings Buffy back, years from where she's supposed to be. He'd be bragging that one up, if Spike of season 2 knew what the hell Buffy was talking about.
La Belle et la Bête by Wonder and Ashes - So Buffy’s life was foretold in a famous fairy tale. Who knew? She and Spike certainly didn’t, despite being the protagonists of this unexpected love story.
Living Vengeance by Ariel Dawn - It's 1880 and Elizabeth Cecily “Buffy” Underwood is forced to choose between her duty as the Chosen One and the young man who passionately loves her.
Offers You Can't Refuse by sweetprincipale - Late S.3 AU. Buffy's only way to stay alive and expose a plot by a deranged Quentin Travers involves staying out of Sunnydale and staying one step ahead while Giles finds a way to save her life and get the evidence to stop the corrupt Head of the Council. But who watches the Slayer's back when she's the prey? Someone makes Spike an offer he can't refuse- but not what you'd expect.
Out of the Ashes by Revello_1620 - What if it wasn't Angel who left S3? Feeling lost Buffy heads off to find who she is without Angel and her Sunnydale friends and Spike just happens to be on the same personal journey.
Pinch Hitter by dreamweaver - Buffy vanishes after stopping Adam and the Powers That Be bring over another Buffy from a parallel dimension to take her place. But this Buffy is not what everyone expects.
Prodigal by coalitiongirl - After killing Angel, Buffy ran away and never returned. Now, over three years later, the next Slayer has been killed by Glory, and Buffy is needed again. But she returns to find that Sunnydale doesn’t want her- especially not the witch gone off the deep end and the newly resurrected Slayer whose boytoy is the only one who seems happy to see her…
Promise of Frost by Eurydice - When a snowstorm strands Buffy and Spike, they are forced to turn to each other for strength, especially when a missing Giles, mysterious visitors, and way too much magic threatens to turn it into a not so very merry Christmas. Set mid-S4.
Proud Trophies Won in Foreign Fights by Baprosia - Instead of sending Buffy on to her well-deserved reward, Glory's portal spits Buffy out into Spike's evil past.
Replacement by sus - After years of struggling for a life of her own, the immortal Slayer is finally free from the demands of her friends and the Council. Will she be willing to go back in time and do it all over again, just for the chance to be with the vampire that was always meant to be her other half? An enemy from the future will give her the chance, if she wants it.
Restfield by maryperk - Twenty years after NFA and Buffy's final death, Spike takes one last mission for the Council to discover if an elusive woman is really a Slayer.
Second Chance by Jackofspikes - After Angel and his team lose the battle in the Alley, everyone dies, and the Powers offer Buffy a chance to go back and fix it all. There's a prophecy involved, and Buffy is not the only one to go back. She is sent back to when The Master 'killed' her the first time, but in this story her return to her old body happens before the body dies.
Second String Scoobies by Jackofspikes - The 'B' team has had enough! Tara takes matters into her own hands and decides it's time to show just what 'the un-important' members of the scoobies are capable of.
Someday by Sunalso - AU. The world is broken, but Buffy is given seven days to make it better. Does saving humanity mean letting go of the one thing she wants, or grabbing on to it with both hands?
Something Redux by dreamweaver - A year after Spike’s death in the Hellmouth, Buffy is flung back in time.
Stitched Up by bewildered -
Something goes horribly, horribly awry with Willow’s ensoulment spell, and Angel’s soul finds an unexpected home – in his dirty laundry. Read now the tale of a Sock with a Soul; it’s on a mission to help the helpless, and it’s starting with Spike and Buffy.
Such Great Heights by Enigmaticblue - When Buffy falls through the portal in The Gift, she doesn’t die. Instead, she turns up in Sunnydale—twenty years in the future. What happens when the one person she thought she’d never be happy to see is the one person who’s stayed the same?
Tales from a New Body by OffYourBird - Buffy has been getting really good at dying; it's the coming back to life part that keeps throwing her for a loop.
Taste of Juliet by Megan - Set during Buffy the Vampire Slayer Season 4. Buffy's evening takes a drastic turn when she discovers an extremely ill Spike, collapsed and half-starved on a stormy Sunnydale night. It isn't until she promises to help him that she realizes that her life will never be the same.
The Butterfly Effect by cousinjean - Five months after the events of "Chosen," a still grieving Buffy must follow a time-travelling demon back to 1997 (circa Season 2) Sunnydale to prevent him from destroying the timeline--and try not to destroy it herself in the process.
The Demon in Me by Spikeschilde - After sharing her night of passion with Angel, Buffy is thrown into a situation she never thought possible beyond her wildest dreams. Forced to learn to live with the changes within herself, she finds comfort and understanding in someone she never had thought of as anything but a monster.
The Dimension Adventures by maryperk - Starts in ATS5 goes AU (really AU) from there. Angel does a spell that unleashes Black Willow. Spike, Buffy and Dawn must escape the dimension to keep Dawn safe from Willow. What adventures will our daring trio face as they move through the dimensions? Will they find their way home? Follow them as they meet old friends and make new ones.
The Order of the Light by ImmortallySpuffy - In a world far removed from their own, the Scoobies plus others are called to help fight back an evil new foe. Joined by a new ally the gang will have to fight to survive. Can the gang survive this new world? Or will the new threat be more than they can handle?
The Rose by coalitiongirl - The Watchers Academy- where young potential slayers and watchers go to train in demonology, magic, and combat so that they can someday fight vampires, demons, and the forces of evil. There are evil magic professors, a principal with a secret, and an unbreachable wall between the slayers and the watchers. And in the basement, imprisoned vampires scheme and dream of destroying them all...
The Scoobies Discover Nature by OffYourBird - Our team of plucky Scoobies and their reluctant neighboring vampire have survived a lot on the Hellmouth. Will swarms of mosquitos, granola-stealing squirrels, and seriously uncooperative weather turn out to be their undoing? Or will some of them simply start undoing their clothes?
The Secret Slayer by maryperk - Something unexpected happens to Buffy on her first night in Sunnydale. Something that causes her to change her name and hide from the people that were to be her friends. What happens when a certain peroxide blond vampire rolls into town?
The Seventh Slayer by kantayra - The year is 2058, and Slayers are pitted against each other in a war between the Watchers Council and a group that calls themselves...the Scoobies?
The Writing on the Wall by Holly - There was no body to bury. There was no funeral. There was nothing but the three rules and the knowledge that a thousand years of torment was nothing compared to a world without her in it. Spike embarks on a journey through the Gates of Hell to rescue the one he loves, but in order to save her, he must risk losing himself.
Tomorrow, and Tomorrow, and Tomorrow by Sunalso - Buffy has fallen into darkness and been forced to become a ghost in her own past. Only she didn't come back alone. What will it take to overcome depression, obsession, and death so that she can learn to live, love, and laugh again.
Unliving Conditions by Wonder and Ashes - Buffy discovers that Harmony is her college roommate, but that doesn’t mean the world is ending. Probably.
With All My Heart by spikeslovebite - Post Chosen. Fed up with their lies and deceitful ways, Buffy has broken off from both her friends and the Council, but she doesn't know that they are still meddling in her life. She doesn't know they set up a slayer to pose as "Buffy" in Rome, nor does she know that Spike is back. She's living a quiet life mourning her lost Champion when the Powers-that-be decide her that her duty is not done.
