He smiled in appreciation at her understanding of his need for a bit of male machoness in paying for them both. He left a few bills and slipped her the rest back. "Wait, as much as you travel, you don't know what an ATM is? Well, I suppose you stick to the Wizarding world, don't you? An ATM is a very handy little muggle gadget where you put in a card..." he pulled out his ATM card and showed her. "You type in some numbers and it pulls money out of your account and gives it to you. It's like a Gringots vault that you can access anywhere."
Smiling a bit ruefully, she tucked the notes back in her wallet. It was useless to argue, in addition to being remarkably sweet. "That's brilliant," she marveled. Sure, she knew bits and snatches about the muggle experience, but she had been raised with magic her whole life and had never really needed to assimilate much to muggle culture. "Yeah, I mean, I love spending time in the muggle world, but there's just so much to it - especially when we don't even fully understand the magical world."
He nodded. "Well, yeah... I get that, completely. I suppose I'm just surprised, that's all." he stood. "And in the muggle world, there's an ATM on nearly every corner, so it shouldn't be too much of a stretch to find one. You all sorted?" he asked with a smile, presenting his arm for her to take.
As he spoke, she'd returned her wallet to her bag. She slipped it onto her shoulder before taking his arm. He did things like that, little things, polite chivalrous things with a remarkable ease; especially when she got the distinct impression that such gestures weren't quite the norm anymore. "Absolutely," she replied. As they started walking down the street she asked, "How long did it take you to get yourself accustomed to the wizarding world? Was it hard?" He loved doing small things that he knew she'd like, and that were the right thing to do. "It was incredibly hard!" he said with a nod. "At first I had no idea what was going on... thought it was a joke, really. I mean, I suppose I likely wasn't any different than any other 11 year old being brought from a life in the muggle world into Hogwarts. Well, maybe a bit different." he chuckled.
It was almost strange to think that he'd once had no idea he was a wizard, but from what Luna could tell, it was something of a shock to every muggle born she knew. She smiled wider when he chuckled. "You know, for all the differences, nearly half the stuff muggles call technology seem like magic to me."
He nodded, leading her around the corner and happening upon an ATM. "Oh, yeah... well, I suppose muggles make technology to make up for the lack of magic... machines that wash dishes rather than spells, things like that." he nodded, stepping up to the ATM and pulling out his card. "Watch this." he offered with a grin, feeding the card into the slot and going through the motions. He didn't mind Luna knowing all his information... his pin, his balance... he didn't care. He just wanted to show her the amazing technology that she didn't know about. As the machine spit out muggle money, he smiled proudly, taking his card back. "Isn't that brilliant?"