Lazy Robert; or, the Colonel's Servant by Madeline Leslie

ROBERT came in at dusk with flushed cheeks, and sat down with a book of engravings, trying to avoid meeting his aunt's eye.

Presently, he called Marion to the corner of the room, and began to whisper to her. They grew quite merry over the conversation, and his aunt, in passing, heard him say: "I wouldn't tell any body but you."