Try these:
Time of Change by maryperk
SUMMARY: Spike and five others who went back in time with him. (time travel from post series to pre-series)
And Here We Go Round Again by Megan (back to School Hard)
SUMMARY: Following on from the end of As You Were. Spike, devastated by Buffy's rejection, finds solace in a bottle shared with Anya and finds his unlife turned completely on its head. He finds that vengeance might not be for losers after all as he is thrust into the opportunity of a lifetime. But can he convince Buffy to take the risk?