Settings Day

Soulmate AU, in which whatever is on a person's skin can also be seen on the skin of their soulmate.

Alec Lightwood has always been an artist. When he was a child, he'd draw all over his hands and arms. As an adult, if he runs out of paper, he crosses onto his arms. But the best things he writes on himself are the words he exchanges with a faceless, nameless stranger, who lives halfway across the world. His soulmate.

Or: In which Alec has a soulmate, Jace is a good brother, and the world really seems to be out to make this whole thing difficult.