I think Spike was reduced to his demon by the initiative, I'm a little unsure on that but he was already with Buffy and they took him back to Giles', Angel was there too. Angel and Buffy decided to feed Spike some of Angel's blood to see if that helped bring him round but, as he tasted Buffy in his blood, it set him off in possession mode and Buffy was basically kept in the room by him as he took her s.exually repeatedly to satisfy the demon's need to make his claim known. Buffy was totally understanding but Spike was mortified when he came back to himself. Any idea which fic this is? | 
