A Wish to Transcend Time - Devilgram
Note: This Devilgram's story content is identical in both "Obey Me!" and "Nightbringer."
"I bet we've been pulled into..."
The next day, Lucifer and MC are spending the day together getting various snacks during a walk, and attending a movie. He walks them home to Cocytus Hall, and then they part ways. Before MC can enter the building, however, they are teleported back to the streets of the Devildom, where Lucifer is talking about the snacks just as before. The day either progresses the same as before, or MC can insist on a change, and after their parting that night, the same loop starts again.
This time, both of them are aware of the magic time loop they are stuck in, and deduce that the secret wish the hourglass granted was giving Lucifer more time with MC. Lucifer attempts to appeal to the hourglass to undo its magic, as it deviated from what he wanted, but this results in the hourglass expanding and trapping him inside. With Barbatos's help, Lucifer is freed, and time finally starts moving again.