[It's clear he's said something that at the very least has caused her to pause. But Sephiroth is much too well-mannered to pick at it, he allows his attention to drift around the room some in the meantime, while Lust picks her train of thought up again.

He nods carefully along with her comment about being mortal; it sounds about right.

It was his turn to take a pause as the remark about not liking her much was expressed. In a roundabout way Sephiroth empathizes to a certain extent, given that he's been living the 'human' life for all of his already, yet kindness and sympathy don't come easily given the circumstances in which he had been living it, before.]

I don't dislike you. [Which in many ways weighs a lot more to him than particularly clicking with another person, or not. Sephiroth then looks around quickly before lowering his voice a little, leaning a little further over the table to share something a little more private; she had, so he felt it was only fair to do so.]

I spent an entire life living what I had always considered a human existence. Until suddenly it wasn't.