Winters Storm is a brilliant fic.

Curiosity by palerider *I have this in word but a lot of the formatting is all over the place*
Summary: All Human. Buffy lost her husband Angel in a car wreck two years ago, her life seems so pointless, she regrets not having children and is now desperate for a baby. She hates her job, but more than that she hates her womanizing boss. William Devlin. But when he offers her a bit of private work it will change her life forever.When It Rains by bittenandstaked *Again I have this in word with mixed formatting*
All Human AU. Buffy Summers is a fresh faced girl just graduated from college. Moving to New York City with her best friend Willow, she dreams of life in the fast lane and a great career but finds herself faced with the slightly more grim reality of a highly competitive marketing world. When she meets William on a rainy day and confesses about how badly her last interview went she suddenly finds she has a guardian angel, or has she?The Victim by bittersweetbloodbaby
AU Spike's the Big Bad, but Buffy's just an ordinary girl, aka, lunchables. How one of the most powerful agents of evil developed a soft spot for a certain high school girl.Lost in Time series by spikeskat
Criminal Games by Ashlee
William 'Spike' Reed is the most successful art thief on record- and he's never been caught. As one of the most powerful men in the country, he has managed to elude arrest for years while still maintaining a prominent status. When FBI Agent Buffy Summers is assigned to go undercover to capture him, she's entered a game that she's not sure she can win.Crystal by vanilla
A beautiful blonde is undercover for the FBI in Los Angeles. She is working as a computer hacker for one of the country's richest, dirtiest, and most handsome businessmen, who just happens to have a few secrets of his own. Sparks fly, because don't they always? Crave by nautibitz
Devilish billionaire Spike Pratt is accustomed to getting what he wants -- and what he wants is his beguiling, headstrong new daughter-in-law. Buffy refuses to give in to his relentless advances -- at first. As she learns about the amazing man behind the armor, she can't help but shed her own... But what will happen when she finally digs up his family's buried secrets -- and when her husband discovers hers?The Art of Immortality by Dusty273 (he has authority in this but is more of a recluse so I don't know if you would feel that undermines it.)
Buffy has fallen in love with the work of an up and coming artist that has taken the world of art by storm... William Wellington, a known recluse. When presented with a rare opportunity to attend a private showing of his latest works, she accepts. As her evening unfolds, she meets a handsome, sophisticated stranger who harbors many dark and dangerous secrets. Her strong attraction for the mysterious man coupled with an unexpected gift changes the course of her life in a way she never could have imagined in her wildest of dreams.Crossing into unchipped country by Dutchbuffy2305 (there is an alt dimension Spike who is master of SD in this, I wouldn't recommend the sequel personally and this aspect isn't in that, but this first one is great.)
Post-Chosen; Buffy thinks Spike is dead. She crosses dimensions and encounters another, unsouled Spike...400 Days by passionfish
Buffy and Spike get thrown into another dimension...or is it?Kidnapped by Her Lord and Master by greyangel *I have this in word*
: All human. Arrogant, aristocratic and ruthless businessman, Lord William Beauford, tricked naïve Elizabeth Summers into his bed and broke her heart. Eighteen months later William finds her again, but she's no longer the same girl who fell so eagerly into his arms. Yet, there's more than one surprise in store for William while he pursues a hostile and very reluctant Elizabeth. When she refuses to see things his way, William resorts to kidnapping to win his girl's heart.Welcome to the jungle by niamh (position of authority just as a cop)
Human. On the trail of a killer, Spike finds more than he expected.