It made him much more uncomfortable than we were.

I suppose it was because we're more used to Mum." "What did the silly idiot want to give us away at all for ?" said the unappeased Erebus.
"Oh, well; he didn't mean to.

It was an accident, you know," said the Terror.
His provident mind foresaw advantages to be attained from a closer intimacy with Sir James.
"Accident! People shouldn't have accidents like that!" said Erebus in a tone of bitter scorn.
When he and Mrs.Dangerfield came out of the park, Sir James diplomatically fell to lauding the Twins to the skies, their beauty, their grace and their intelligence.

The diplomacy was not natural (he was no diplomat) but accidental: the Twins were the only subject he could at the moment think of.

He could not have found a quicker way to Mrs.Dangerfield's approval.