Once Upon a Fic Exchange

This year I'm nominating Sheath and Knife because I'm living dangerously.

This is the source page on it:

https://www.sacred-texts.com/neu/eng/child/ch016.htm

It includes variations. Right now as I write this I'm very tired and have no preference on the specific version used (i.e. 16A or 16B etc.) Basically I just assume this means this is child ballad 16.

I did a bit of an approximation in terms of characters--I looked at the archive and found 2 fics for this, one of which used OMC/OFC format and one listed no characters. Apologies if this leads to any confusion, I just went with brother, sister, father. I am happy to change it. It seems it hasn't been nominated in a previous year.