One of my favorite albums is Swans' "Soundtracks for the Blind". That album gave me plenty of inspiration to do some of my works. What you hear is a mix of accoustic guitars layered one upon another, including a soundfount as well but I can't remember which one, and they were all paulstretched. I believe this track is about Freya and Amarant's relationship in the fic, but it could be about dysfunctionality as well.

https://www.fanfiction.net/s/2458776/1/Thirteen-Ways-To-Say-Goodnight