buffy and spike mate to rescue dru and angel

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This is driving me crazy! I know I have this fic somewhere but I can't find it to read!

Set approximately season 4, Spike comes to Buffy for help because Angel and Dru have been taken captive by a vampire society because they aren't the ideal vampire.  They mate and live together for a while so the society takes them seriously and then fight to rescue Angel and Dru.  Parker shows up as a random delivery boy, and Buffy kills him in an effort to stay with Spike. Meanwhile, Spike thinks she went to scare him off and leaves Buffy after they rescue the others. 

I swear its just on the tip of my toungue!  Help me regain my sanity, please!