Here is another by cousinjean. This is one of my absolute favorite fics of all time! Involves a time traveling demon and a future Buffy returning to Season 2.
The Butterfly Effect by
cousinjeanFive months after the events of "Chosen," a still grieving Buffy must follow a time-travelling demon back to 1997 (circa Season 2) Sunnydale to prevent him from destroying the timeline--and try not to destroy it herself in the process.
And Here We Go Round Again by
PetaSummary: Spike takes a trip back in time to School Hard to see how possible it could be to make a Buffy,free from the trauma of first love with Angel,fall in love with him. Will this be the first one of Spike's plans to succeed??
I hope I am understanding your criteria correctly. If not, I apologize!