Conjure Wife by Fritz Leiber

Tansy was in a radiant mood, prettier than she had seemed in months, younger-looking than her thirty-six years. Twice he caught her smiling to herself, when he glanced up from his supper.

He gave her the note from Mrs. Gunnison. "Mrs. Carr asked after you, too. Gushed all over me -- in a ladylike way, of course. Then, later on -- " He caught himself as he started to tell about the cigarette, and Mrs. Carr cutting him, and the interview in her office. No use worrying Tansy with things that might be considered bad luck. No telling what further constructions she might put upon them.