Lust's worst fear was to not be desired because it'd mean she'd cease to exist. If she didn't have people constantly falling all over her, it put her in the temperament of a five year old. Actually lots of things made her act like a five year old, she was a sin, they sorta had this whole selfish thing going.
But she instantly perked up when Nicholas came bounding over like a puppy. "Hey there, Batman.." she looked behind him and back to him, "Not fighting crime tonight?" she leaned into Wrath a little as if to tell her sister yeah that's not gonna last long.. they had plans for dear Nicky.