Nana by Émile Zola

Toward the end of September Count Muffat, who was to dine at Nana's that evening, came at nightfall to inform her of a summons to the Tuileries. The lamps in the house had not been lit yet, and the servants were laughing uproariously in the kitchen regions as he softly mounted the stairs, where the tall windows gleamed in warm shadow. The door of the drawing room up-stairs opened noiselessly. A faint pink glow was dying out on the ceiling of the room, and the red hangings, the deep divans, the lacquered furniture, with their medley of embroidered fabrics and bronzes and china, were already sleeping under a slowly creeping flood of shadows, which drowned nooks and corners and blotted out the gleam of ivory and the glint of gold. And there in the darkness, on the white surface of a wide, outspread petticoat, which alone remained clearly visible, he saw Nana lying stretched in the arms of Georges. Denial in any shape or form was impossible. He gave a choking cry and stood gaping at them.

Nana had bounded up, and now she pushed him into the bedroom in order to give the lad time to escape.