ACD fic with soulmate tattoos

[dreamtimegirl.livejournal.com]

I'm looking for an Holmes/Watson ACD fic where your soulmate's face appears on your body as a tattoo. There's a special word for someone with a same-sex soulmate, and one for someone without a tattoo at all.

Watson had Mary's face on his back, and after she died it reformed into Holmes'. I think Holmes had Watson's face all along. They find this out when someone goes around trying to cut the soulmate tattoos out of people.

Any help would be amazing!