She understands what a king is and its concept, especially in the World Above. She also knows that drow society is different from most other societies. And he's an elf, a Banre being with an elf is a way to cut her ties with her old home.
@@dllps Yeah but in the context of the conversation she's talking about being one in Menzobaranzon, the Matriarchal Kingdom of Lloth worshippers. Make much more sense for her to be Queen and he be her consort. I'm kinda being nitpicky though