I know some people see it as cute and as her own kind of endearment for him, but it grates on my nerves when she called him that
Like in today's episode. She is crying, out of her senses, and she still is managing to call him 'Mr. Khan'
And he continues to call her 'Ms. Farooqui'
I think we are well past the point where the two would be comfortable calling each other Asad and Zoya.
It would be nice to see at least that one barrier of formality between them to fall.