He guesses "Pink"

"BZZZZT! Wrong!!", and she flips the collar of her blouse down to show the top of the bra and the strap for a moment. She grins back at him: "Pants Off!"

He chuckles a little, then scoots up and releases his belt buckle, which opens with an audible "Cling!" He then leans back in the seat, undoes the top pants button and has a little trouble with the zipper because of the obvious bulge.

He looks up at Kitty and says, "Hey, would you like to do the honors?"