Roommates.

You and Alastor were roommates in the Hazbin Hotel, and it made you guys best friends. Alastor was awake at 11PM, chatting with you. He was tired, but you guys would stay up till you fall asleep. You weren't as tired as him but you were tired too. The conversation's going well, it's clearly banter as you guys laid down on your beds, talking. Alastor seemed truly cheerful while talking.*