I interpret the song as someone whos vulnerable to the point that they don't even care whoever hurts them at this point and that's why it reminded me of PV & SM in the AU :3
So yeah thats why I chose it (Plz don't take its name out of context PLEASE-)
Ooh I can see that! I’m not really good at interpreting songs but also have you considered The Devil Within by Digital Daggers. It’s just a Shadow Milk song in general
Edit: found another one, if you want something strictly pureshadow oriented I suggest Love Me Dead by Ludo