The smack drew the expected giggle and squirm, but other than one more look backward, in which she caught his movement with the mirror-
"Eyes on the road, Batman."
-she focused on the food she was preparing in the backseat. It didn't come without commentary, Claire remarking on how neat the cooler was with its two part lid to have someplace to prepare food, but she did it quickly, and a ham sandwich and a sandwich from the roast were eventually made with all the fixings he liked or would tolerate (he had to get vegetables in him somehow). Claire wrapped them in napkins with a corner folded back, so the sandwich contents wouldn't spill in his lap, then she dug out three sodas – knowing how much he typically drank – and settled back in her seat.
Laying the roast sandwich and one soda bottle down between them, she passed him the ham one and then unscrewed the tops of the other two sodas, one for him and one for her, before sticking one between his thighs.
Deliberately. It was also convenient, yes, because there wasn't a cup holder console in the car, but still deliberate.
"There! One refreshing soda, to cool you off," she said, eyes dancing wickedly as she lifted the bottle to her mouth and drank.