In the mood for some serious angst...preferably all human, but not completely necessary.

Finally! Something I know!

Ain't No Sunshine by Mrs Muir

http://dark-solace.org/elysian/viewstory.php?sid=448&warning=NC-17

Summary: William 'Spike' Nagle was still a rookie cop when he got the break of his career. Aiding in the rescue of fourteen-year-old kidnap victim, Buffy Anne Summers, changed not only his job status but his personal life. Four years later she's come back into his world insisting she wasn't the only victim. Together they search for the girl that everyone else says doesn't exist. In the process of discovering the truth, Buffy struggles to reclaim her life and ends up changing Spike's yet again.

Followed by its sequel:

Wheel In the Sky by Mrs Muir


Summary: The sequel to Ain't No Sunshine. Buffy once again bursts into Spike's life, disrupting it with yet another mystery to solve, and making him see her as the woman she has become. Will they find the love they once shared? Or decide that friendship is the only thing they have left to share. WIP



Also by Mrs Muir:

Sanctuary by Mrs Muir

http://dark-solace.org/elysian/viewstory.php?sid=876

Summary: AU-Fantasy. William Nagle III and Alexander Harris have been best friends since the first day they met at Hyperion Preparatory School. Through the years they have always been there for each other, but one of them holds a deadly secret that will affect William's future with Buffy, the woman he loves. Will Buffy be able to hold onto the man she loves or will the secret tear them apart?



Bring Me to Life By sweetie

http://www.nocturnal-light.net/fanfiction/story/240/Bring_Me_to_Life/all

Summary: AU. Buffy Summers is the blind daughter of a wealthy business man. Spike Tyler is the misogynistic ex-cop hired to kill her. With five hundred grand on the line and LA's finest police hot on their tail, will Spike be able to go through with it? More importantly, will he be able to look past the abuse he experienced as a child and see that not all women are who he made them out to be?




His Dirty Little Secret by jamesgirl

http://spikeluver.com/SpuffyRealm/viewstory.php?sid=24000&warning=NC-17

Summary: William 'Spike' Giles and Buffy Summers are both students at Sunnydale High, but they lead two very different lives. Spike has it all – looks, wealth and popularity. Buffy has nothing – since her parents divorced, she's been living in the servants' quarters of the Giles mansion, where her mother earns a meager living as a maid. But beyond these differences, they have a secret relationship – at school, Spike pretends not to know her, but at night he visits her room with growing regularity...




This is a WIP but I love it and it is seriously angsty and dark:

Playing on the Dark Side by pj

http://spikeluver.com/SpuffyRealm/viewstory.php?sid=10189

Summary: When Buffy's mother dies suddenly, she withdraws from her friends and family, and runs away from home. Venturing the streets of L.A. by herself, she is abducted by a gang when she accidentally interferes in their business. Buffy finds herself in the middle of a cruel life, where violence and rape aren't given a second thought. Can Spike save her from this life...or can she save him? A story about rape, whether redemption is even possible, and whether love can triumph from it.

Blood Lines Divided by Kimber

http://spikeluver.com/SpuffyRealm/viewstory.php?sid=15824

Summary: Buffy Summers is the middle child of Hank and Joyce Summers. What happens when the youngest comes in harms way. Dark Fic..... WIP

Anything by Dreamsofspike.

These aren't all human but can be pretty sad.

Fallo by Batdz Angel
Summary: Fallo. To deceive

The Wind is Piercing by Batdz Angel
Summary: Returned to the world she died to save, Buffy is unable to face those who resurrected her. When Spike is accused of keeping her from her real family, she reacts in a way no one had ever thought was possible. SPUFFY, AU AfterlifeSeason Six.

Bag of Bones by Shadowlass
Summary: Spike's return to Sunnydale, version 3,892. Nobody's rolling out the welcome mat...but someone has got a little surprise for him. S/B. COMPLETE

Five Stages of Grief by Casscaro
Summary: A series of five paired scenes based very loosely on one model of the five stages we go through when we grieve: Denial, Anger, Bargaining, Depression and Acceptance. So you may gather from that there is some angst involved. Post 'Chosen', Buffy and Spike

Normal Again by Richard Bachman
Summary: COMPLETED; based on the episode Normal Again. Instead of Buffy, Spike was poisoned by the demon and his consciousness was transported into an alternative reality where he found himself incarcerated in an asylum.

This one is all human.
Traveling Soldier by Zarrah
Summary: AU...SB...Based on the song 'Traveling Soldier'. Buffy meets William on his way to war. Share their growing love through letters. Come inside for the complete summery! Complete

Hope these help.