He fucked his step sister in the dark thinking she was his wife

He tried to fuck his wife but ended up banging his step sister in the dark. He slipped into her room thinking it was his wife's. He climbed on top of her and started pounding her wet pussy. She was moaning and begging for more. He was thrusting harder and harder until he came inside her. He realized his mistake when he saw her face in the morning light. She was smiling and ready for more.