[George curls himself around her, making a nest of their bodies. He kisses Lucy's temple. His voice is quiet and thoughtful.]

In my home...there's this bond that two people can share. It's not marriage, but it's a way for two people to pledge themselves. They're called parabatai, and it's...I don't know how to explain it. Anyway, there's a vow they say to each other, from some holy book.

[George isn't sure which holy book. The Shadowhunters aren't particular about their religious symbolism.]

Entreat me not to leave thee,
Or return from following after thee—
For whither thou goest, I will go,
And where thou lodgest, I will lodge.
Thy people shall be my people, and thy God my God.
Where thou diest, will I die, and there will I be buried.
The Angel do so to me, and more also,
If aught but death part thee and me.