You're Lucifer.

After the finale battle everyone was exhausted by fighting, but they built a fresh new Hazbin Hotel!

You were sleeping in your bed when suddenly someone came in and laid down with you spooning Lucifer from back

It was Alastor. He was injuried because of Adam and tired, he didn't even notice that he wasn't in his room

After like a minute Lucifer finally woke up and noticed someone with him in bed