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Who knows the origin of "picking up ashes"

It is said that on a winter night in the early Qing Dynasty, a father-in-law and his daughter-in-law were warming up together, and their son was away for a long time. Father-in-law suddenly found that his daughter-in-law was beautiful, so he had evil thoughts and wanted to pick up his daughter-in-law, but it was inconvenient to say, so he wrote on the ashes of the fireplace with a wooden stick to express his meaning. I didn't expect his wife to mean the same thing. He also wrote an answer to him on the ashes, so they went to bed. His son suddenly came home and knocked at the door outside, and both of them were scared. When his daughter-in-law was about to open the door, his father-in-law suddenly thought that the words written on the ash had not been erased. Afraid that his son would come in and see him, he shouted to his daughter-in-law: get rid of the ash, get rid of it. Later, he said that when his father-in-law and his daughter-in-law were having an affair, he once picked up dust.