I also have listed in my Calibre:
Accidentally Yours by _3xy_
Summary: Buffy and Spike accidentally claim each other. Starts from the end of "Lover's Walk".
Delust or Dust by dampersandspoons
Summary: Spike has returned to Sunnydale, heartbroken that Drusilla has left him. When a love spell goes horribly wrong, how will the Scoobies react when the slayer gets involved with yet another vampire? Will Giles wipe his glasses in disapproval? Will Xander not understand but be too enamored with the visuals to say anything? Is Angel going to brood about it or will he do something more? WHAT WILL HAPPEN?
Legacy by Kyra Storm
Summary: This story is based on Challenge #87 on the Bloodshedverse, issued by Bloodshed Baby. The challenge reads like this: Another early season "lost somewhere and having to rely on each other to survive" Spuffy story in the same vein as Castaway, Stranded, The Game series, etc. (Oh come on, you know these kind of fics are fun). The challenge? Trying to come up with a plot/story line that is somewhat unique (or not) yet keeps us on the edge of our seats. Can be time travel, stuck somewhere, kidnapped, etc. Set in Season 3, after Lover's Walk, Vampire Council decides to punish those responsible for the state the Aurelius line is in and kidnap Buffy and Spike.
And sightly off topic as the plot point is that the last time Buffy and Spike saw each other was Lover's Walk but it is set 7 years post series:
Peace and Love by Kari Mouke
Seven years after the end of the series, Buffy is living in the seaside town of Anastasport. She hasn't seen Spike since Lover's Walk. What would life have been like for her without him? What would like have been like for him without her? What will life be like now with each other? Filled with peace and love. Oh yeah, and some hot lovin'.
NC17 for sex. M/F Spike/Buffy paring.