I was reading a fic at

Angelus tatooing a cross on a vamp. Or having it done to Angel (by human or vampire). Maybe even using a bit of holy water to clean the needle. It seems like it would be the ultimate torture for a vamp.
Has this been done? If so, can you point me in to a story that has it? (No drabbles though please.)
Yes, I know I usually don't go for the dark/violent/torture fics, but this idea intrigues me.