im looking for a fic where spike's demon has to take over in order to protect himself after being tortured by the initiative. i believe he and buffy are either mated or possibly his demon just recognizes her as his mate.

This might be "Taste of Juliet" by Peta on this site.

Is it Bad Medicine by Addie Logan??

Onefidget was your fic found?

no.. i thought it was taste of juliet.. but when i went back and read it.. it wasnt the one i was searching for.. although it was similar. i appreciate the suggestion though

Is it...

Return to Me by Jypzrose

Eight months ago Spike disappeared without a trace, leaving the Scoobies behind to frantically search for him. Just as they are about to give up, he shows up at Buffy's house, wild, broken, and unable to speak. What happened to him, and can Buffy, with Angel, help him?

...?