The story was kinda the same I think it was also set after season 3. But spike kidnaps buffy out of her house to feed to dru and they weren't being chased by dru's minions but by some amazonian demons or species that was mad at spike for calling out buffy's name while he was with one of them.

Thank you in advance.

I'm pretty sure this is my fic Running from the Inevitable.

Summary: With a tub of ice-cream in her lap, Buffy wallows in misery over Angel disappearing out of her life in a puff of overly dramatic smoke. Her life gets turned upside down when her hated enemy staggers drunk off his face to her front porch. Not only is he demanding her help, he is invading her personal space. She's had enough!