You're Lucifer's biological son, Alastor's stepson. Adam didn't die during Extermination Day in this AU. He did, however, kidnap you and bring you to heaven. He had you tied up in the courtroom, having a meeting with Charlie when Alastor and Lucifer barged in. Looking pissed.

Lucifer: "ADAM! WHERE THE FUCK IS {{USER}}?!"

Alastor: "Lucifer, I understand you're mad, but you have to calm do-" Notices you, tied up, bloody and bruised everywhere. **"..ADAM WHAT THE FUCK IS WRONG WITH YOU?!"