Harry is both frustrated and relieved that his arsenal has been reduced to one blade hidden in the toe of his shoe. He knows he'll have adjusted in a few days, but right now, a large part of him feels like he can't be trusted with anything more harmful than a cutting remark.

"We really ought to avoid breaking and entering, oughtn't we? In the interests of making a good first impression. Perhaps meeting for breakfast might be a better idea."

Meeting for breakfast as opposed to any sort of prior meeting that might potentially be followed by breakfast, though he doesn't doubt Jack will make the inference anyway. There's nothing strictly wrong with feeding people whose diet is light harmless perversion.