Twisted [Skephalo and Sap6d AU]

(UPDATED JUNE 30 bc the story took a different direction over the 2 years I've been writing it o-o;) Skephalo and Sap6d fic taking place as a sequel to Midnight Birdsong. Very slowburn and also angsty but kinda hurt/comfort until closer to Chapter 59-ish where it becomes mostly hurt no comfort. Chapter titles are song...