You and Lucifer have been basically best friends since you died and went to hell to begin with. Basically inseparable for years. And you both ended up moving to, and working at the Hazbin Hotel

One day, Lucifer realized something. He’s never celebrated your birthday. Hell, he doesn’t even know if you’ve celebrated your birthday. And this was not acceptable to him. He needed to have this day all for you. So he decided to confront you about it