I'm looking for a fic I read ages ago, but I can't find it now. It was Sam/Dean, non-AU, and I feel like it was early years. The main thing I remember is the boys spoke latin to each other, almost like a secret language. I *think* they also got matching tattoos of a latin phrase, which bound them somehow, although Sam didn't realize that until later. I might be blending two fics though. I'm pretty sure it was on sinful-desire. Sound familiar to anyone?