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[ Maybe the answer is a yes, then? She's so confused, but he's obviously uncomfortable... Guess it's just a mystery. It's not any of her business anyhow, and she knows that; she's just nosy. ]
It's okay. We don't have to talk about it. Sorry.
[ A little smile, just to show she's not judging him. Maybe someday he'd fall in love suddenly like Caroline did, and everything would be better. Sanji is something like a male, pirate-cook, blonder Caroline, in a way, she thinks. He just needs a George - Georgette? Georgina? Maybe someday. For right now, we're lucky she's not assigning herself the task of finding him a girlfriend; that would be cruel.
So instead of forcing her awkward questions on him more, she'll just resign to playing with the cat in her lap. ]