Arcturus wasn't entirely sure what an internet was, and he wasn't certain that he wanted to know, if it was something dreadfully muggle. He glanced around the room in confusion, hoping for some clue, for something net-like to be immediately visible, but unfortunately nothing he saw seemed to be a likely candidate. Muggles used nets for fishing, he recollected, instead of magic, but he couldn't imagine Narcissa ever went fishing, nor that if she did, she'd see it in any way necessary to do it the muggle way. Arcturus had gone fishing with his father when he'd been little, and he remembered the fun of wading out into the water and trying to cast spells quickly and precisely enough to stun a fish. It was more an exercise in refining his magical skills than anything else, he supposed.
It didn't matter now. He blinked, and turned his attention back to Narcissa. 'I agree,' he said, 'when it's a matter of strict necessity, to our benefit. Not luxury. I can't defend that.' Not to his family, at least. He'd sound horribly spoilt and lazy. If there were luxuries that required using muggle technology, he'd have to look for magical alternatives, or else go without – but Arcturus couldn't think of any, so it was hardly a problem to him.
He was about to try to explain his reasoning to Narcissa, certain that she'd agree, but then he heard that she was willing to explain things to his father, that she knew he'd understand. Arcturus didn't question this for a moment, because it was precisely what he needed to hear. He'd been anxious about it since he was first handed the little telephone-network machine and told to use it to find people he knew. Argument over muggle luxuries forgotten, he smiled back at her.
'He'll listen to you, I'm sure of it. Thank you. I wouldn't even mind...you know, if he were cross over it, because I'd be so pleased to see him, but of course it's better if he isn't. And I'd like very much to learn those enchantments. Especially if they can be used to send secret messages!'