Hi!
Skipper already found one of the fics of this kind for me in the find-a-fic forum ("Come undone"), but I've realized that in my memory it was mixed up with another similar fic.

That's why I decided to ask you wonderful people if you remember any other fic where Spike loses his soul during/after Chosen, no matter the circumstances, but that end up spuffy

My Life Closed Twice by Annaross

Summary: Post-Not Fade Away. Buffy seeks Spike's remains, but then finds him in the most unusal place. Spike/Other, Spike/Buffy. Anaross says, "Not sure where this is going. But new fic. PWP--- Poetry without plot. Well, no poetry yet."

Spike loses his soul, but you don't find out about it until the end.

Noelle
I remember that one, wonderful story!

William The Bloody Is Back by TillDustDoUsPart

Consequences by Forever Me
Summary: That's the thing about magic. There's always consequences. Set a year after the finale, Dawn is convinced that she knows what the consequences of Willows spell are and it doesn't look good.

A Terrible Thing by Herself.

Clocks of the Long Now by Lostboy. One of the best post-Chosen fics EVER.

Misfortune Seemed His Lot
and
What Was Lost (PG-13) The sequel to my one-shot, Misfortune Seemed His Lot. Buffy is miserable and haunted by past mistakes. Spike isn't much better off. Determined to get on with his unlife, he leaves LA and the memories of Sunnydale behind - but, has he really? 15 Chapters. Started January 2008. Completed April 2011. PDF

by spikeskat, on author's site

Here is the link to spikeskat fanfiction site for anyone who wishes to read the fics rec'd from her:

http://spikeskat.rogue-poet.com/seductive_fiction.htm