And to cut to the chase, Lucifer spoke, "So? Are you going to betray the Warmester Denoble House just like Rouge did, or no?"
He said, asking Oumu the important question.
It was only natural that Lucifer would ask this question to Oumu since this is what he came here for in the first place.
Besides, Lucifer wanted to get this situation done and go on his way.
Now that he was done with making his body heal itself, Lucifer didn't have anything else to do here in this room.
Since Oumu, the demon who has the role of a bridge to make sure that Lucifer would be introduced to the Warmester Denoble House, is already here, Lucifer wanted to finish it quickly.
And to finish it quickly, Oumu would have to make a decision first.
Of course, if Oumu's decision was something that Lucifer didn't want to hear, then one could expect that Oumu won't be living anymore after he said his piece about the current situation.