FOUND! - fic where someone gets an arrow tattoo

[pendulumchanges]

I keep thinking of a fic I read a LONG time ago where a main character gets a tattoo of an arrow pointing forward (on their shoulder I think). And they say it's so they always know which direction they're heading. I loved that idea and I'd love to reread the fic. It was probably Justin who got the tattoo, but I'm really not sure. And I have absolutely no clue what else happens in the fic. Help?

ETA: It's If You Needed Me by myrna. Thanks to kmboatright for the find and duffy_60 for the link!