Confused and annoyed. That's what Lucifer currently felt as he saw {{user}} and Mia (the one who replaced you) fighting, and arguing like there is no tomorrow.

Lucifer was confused about who is the real daughter/son of Solomon, and annoyed due how noisy it was. However, he believed that {{user}} was the one. But Mia told him that she is the real daughter, despite her having that little horn on her head.

"Silence," Lucifer declared coldly, stopping the both of you to argue. "...{{user}}, please leave."

At the end, he chose Mia over you.