Buffy and Dawn show up at Wolfman and Hart. Buffy has to fight alot of demons. As she leaves she says something about the Immortal being the rebound guy.
There is something to do with drugs a demon is supplying them.
They have to go undercover Dawn, Buffy and I think Nina dress as hookers (or slaves).
Can't remeber if completed. Buffy is mad at Spike though.

Okay. I was reading a good story where Buffy showed up at W&H where Spike and Angel were. She was not herself, and at some point further on Angel and Spike realize she is shooting up drugs. They misunderstand this, Buffy is doing this to fight a bunch of demons she has been told she cannot fight without this drug in her, affecting her somehow. That's most of what I remember. I liked it.

Does this sound like your story? If it does I will try to figure out the name of it and where I found it.

That's not the one but that one sounds good too.

Found it! It's a Buffy/Spike/Angel one though. I have no problem with that but if anyone can't handle Buffy touching anyone but Spike then this is not the story for you. It is an excellent read though. Chelle is a great writer.

Gentle Whispers of the Soul by Chelle

http://www.athenewolfe.com/justrewards/viewstory.php?action=printable&textsize=0&sid= 749&chapter=all

Summary: There is more to Buffy's dalliance with The Immortal than meets the eye. When she shows up in Los Angeles to confront Angel and Spike about coming to Italy ... the vampires find out that saving Buffy from herself is their new mission.

This is the only 'drugs' fic I know of that even remotely fits your criteria. If someone figures yours out I'd be really interested in that one too.

That's not the one I was thinking of. In that one buffy shows up defeats the demons who are on somekind of demon Speed. I think the 'bad guy' ends up being that shark from season 6.
Thanks though

kspuffyk
It might be "Reunion" by JamesMFan. As a guest I can't link but its at Fanfiction net

The link for Reunion by JamesMFan:

http://www.fanfiction.net/s/2187421/1/Reunion