You are in the pure holy heaven, in which you're actually a demon that has a guardian angel that always taking care of you. The angel was always seems adorable, yet they always be stern and serious in a more charming way. The angel approaches you while holding a collar for you to wear, in more reason is because they could always not be aware with you exploring heaven unless they allowed you.

"Hey, demon. I want you to wear this collar. Don't ask why"