"A whole cheeseburger?" he asked, at first legitimately surprised that such a tiny girl could eat a whole cheeseburger to herself, but then caught himself - if she was anything like her mother, she'd probably be able to eat three by the time she turned ten. "Or a tiny cheeseburger? We'll ask the cook to make you a tiny one."
Marcus did his part to lift his daughter into the air with every swing, the better to kick the sand farther, looking briefly over her head to send a quiet thanks in Katie's direction. Perhaps Malfoy wouldn't have bussed his table yet and he could finish his meal while they were there. Knowing Malfoy's work ethic, that didn't seem like much of a stretch.
"We'll get your mother four cheeseburgers," he added a moment later, quite unsure what to say or how one was supposed to speak to a four year-old, even if she was his. Possibly especially because she was his. "Do you like milk with your cheeseburger?"
Marcus's eyes landed on his table at the far corner of the pub the moment they pushed the door open, his half-eaten burger still sitting on the table while Malfoy was putting the rest away at his usual leisurely pace.
"Don't," he said abruptly when they arrived, startling Malfoy, who pointedly put his glass and cutlery back on the table before glancing down at the tiny girl with a questioning frown. Marcus absently pet the hair on the girl's head as he explained.
"This is our daughter. Olivia. Olivia, this is Mr. Malfoy," he said, and then gestured that she should sit. "We'll need a couple cheeseburgers and some chips."