Hi Luinėcolloien,
I gave it enough thought to write a story on it. I came around from a different direction, where the young, displaced elf didn't know she was immortal until after she had fallen in love. The consequences unravel later.
If you're interested in it, you can find it
here.
I think you could approach it from a wild number of directions, and it's certainly intriguing. You can also look up "The Lonely Star RPG" here at the downs, which has a man/elf marriage with some soul-searching involved.
--Helen