I know it's on this site and I wanna say it's a MaryPerk story but I can't be sure. I have tried searching but have had no luck.
I can't remember much but here goes:
It's post series either Chosen or Not Fade Away, not sure but Spike is dead either way.
She's sent back to I think Season 2 (Sorry I can't remember why) and through the course of the story, the Scoobies gain the same memories that she has.
Spike's still with Dru and although he does have feelings for Buffy, he leaves anyway.
Buffy is okay with it because she knows he will come back which he does.
When he does come back he is reluctant to admit he loves her but she gets him a gift for Xmas? and that's when he knows he has fallen for her.
Dead Spike is actually in his body and has been for 2 or so years but it turned out she had to admit she loved him before he could be released.
She comes home from being out one day to find a pissed Spike who fills her in. I'm sure he's mad because she was keeping things and he says something along the lines of ' I love you with all that I am but if you ever pull something like this again, I'll tan your arse.
Oh and there's a fight with Angel on the lawn too I think.
Hopefully, someone will know the one I mean and thanks in advance | 
