Slash S/X, past non-con X/Aus

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I am seeking a fic which ended as a S/X, I believe. The premise was that when Angel was Angelus, he left Buffy a gift in the manner of raping Xander and carving something on his back. I believe it was a Valentine's gift? Could be mixing stories, however. Anyway, Xander had hacked himself up to get rid of the marks and never mentioned it. The problem arises when the Scooby gang needs Angel back to help with a case. Spike smells/sees how badly it's affecting Xander and looks further into it, only to find out the gobbledygook I rambled about above.

Can someone help me locate this fic? My google fu is broken.

Thanks.