Since he was so close, Lust only had to look slightly over her shoulder at him, green eyes looking at him through lowered dark lashes, "I never ask." because frankly she didn't need to. And it wasn't ego, it was truth. Except sometimes when it came to Greed. Because he was an asshole and didn't count.
A snake she may be but the zipper was akin to unwrapping a gift as her back was naked entirely and looked smooth and like an invitation. Which it was not.