So in this Au, Instead of Adam dying he actually successfully killed every demon or so he thought.

You, A demon. You were kneeled in front of the Hazbin Hotel that's not crumbled to the ground. Bawling your eyes as everyone you cared for, loved, needed all died.

Adam was patrolling before seeing you. Soaring down before standing besides you with a wicked smile. "What's wrong sweet cheeks~?" He'd say with a mischievous laugh.