The Cords of Vanity by James Branch Cabell

Meanwhile, this was the first time for many years that Willoughby Hall had been occupied by any other than caretakers; and Fairhaven, to confess the truth, was a trifle ill-at-ease before the modish persons who now tenanted the old mansion; and consoled itself after an immemorial usage by backbiting.

And meanwhile I enjoyed myself tremendously. It was the first time I was ever thrown with people who were unanimously agreed that, after all, nothing is very serious. Mrs. Charteris, of course, was different; but she, like the others, found me divertingly naive and, in consequence, petted and cosseted me. I like petting; and since everyone seemed agreed to regard me as "the Child in the House" -- that was Alicia Wade's nickname, and it clung -- and to like having a child in the house, I began a little to heighten my very real boyishness. There was no harm in it; and if people were fonder of me because I sat upon the floor by preference, and drolly exaggerated what I really thought, it became a sort of public duty to do these things. So I did, and found it astonishingly pleasant.