Lucifer wasn't about to argue with her on the matter of breaking her word. Honesty was a virtue to him, even if it was one he took his own measure of. A pledge broken was honesty undone.
"To whom have you given what oath?" he asked, curious. His omniscience was limited here; it would take time to adjust to a new Creation and to learn how to listen to it.
"You may know them, if you wish." No doubt, she did. "It clearly is no matter that need concern me."