"I mean, I don't know if we want to eat that much," he quipped with a chuckle. Though really, if snacking on various foods from throughout the continent and doing a bit of shopping along the way would get things back on track and smooth out any awkwardness from them having slept together, he'd take it. Plus it was supporting his mum's charity, and that was kind of a big deal.
Once they reached the counter, he put in his order, then waited for her to order, getting his wallet out as she did. "I've got this one, if you don't mind," he offered. If she wanted to draw the line and pay for her own stuff, he wouldn't push the point, but he'd been raised to meaningfully offer, at least.