It's the 70's. Buffy goes to a swingers party with Faith, who introduces her to Spike

It's the era of free love and Buffy goes to a party with Faith. The girls pick the guys' keys out of a bag and Buffy picks Spike's keys.

I'm sitting this one out at the moment but could it be this one (WIP):

Unlocking Ecstasy by Behind Blue Eyes
Summary: The Seventies was a time of hedonistic pleasures and excess. Sex, drugs, and rock-n-roll were the signatures of the decade. For the sexually adventurous, a certain kind of party was created...the key party.

A seemingly innocent invitation opens up a whole new world for Buffy. Introduced to a mysterious stranger and promises of unspeakable pleasures are offered. Her only task is...reach deep and draw his key.

It's here on TSR.

Unlocking Ecstasy by Behind Blue Eyes Rated: NC-17 [Reviews - 12]

Summary: The Seventies was a time of hedonistic pleasures and excess. $#x, dr^gs, and rock-n-roll were the signatures of the decade. For the $#xually adventurous, a certain kind of party was created...the key party.



A seemingly innocent invitation opens up a whole new world for Buffy. Introduced to a mysterious stranger and promises of unspeakable pleasures are offered. Her only task is...reach deep and draw his key.


Sorry I can't post a link for you.