What are the stories and legends about Su Shi's "picking ash" in history?

Su Dongpo was old and frustrated in officialdom, but his children and grandchildren were full of happiness. One day, Su Dongpo's grandson clamored to go to grandpa's study to play. Although ordinary people couldn't go in his study, he couldn't get around his son, so her daughter-in-law quietly took her son to have a look. Looking at all kinds of classical books in the study, his daughter-in-law couldn't help looking through them and let the children play by. Watching it, I fell asleep. When the child saw his mother sleeping, he felt bored and went to play. At dusk, Su Dongpo went back to his study with his friends, half drunk, and saw his daughter-in-law lying on his bed, thinking that this was not in line with the ethical code, and he was afraid of people gossiping. He hurried out, but in an unguarded moment, he knocked over the incense burner on the table. Taking advantage of the wine and looking at the beautiful woman in bed, Su Dongpo was depressed and wrote two poems in the incense ashes on the table: "There is a pipa in the lotus account, and it is not a good gift to play it." After writing, Su Dongpo withdrew.

When the daughter-in-law woke up, she hurried to leave the study. Suddenly, when she saw the poem left by her father-in-law, her face could not help blushing. The daughter-in-law also knows a few words, and can get a few poems. She replied, "I would like to borrow a pipa to play a song, so that the fat water will not flow out of other people." Write and leave quickly.

When Su Dongpo returned to his study again, he found two more poems on the desk, and he was reading them carefully. Suddenly, he heard something behind him. He looked intently and saw that it was none other than his good friend Chen Jichang. Chen Jichang smiled and asked, "Brother Dongpo, what are you doing?" Su Dongpo quickly wiped the dust off the table with his sleeve, and then casually said, "Nothing, nothing, just scraping the dust ..."