The title is a reference to Yeats's famous line "Milk Spilt on a Stone" (I am a person who "will die on the Star if I don't drop my book bag").
Background of this article: Lao Fu and Xiao Ha secretly fell in love during the war years (I once again ignored their love process). Only a few members of the Order of the Phoenix and the Death Eaters knew about it; but during a fierce battle in the Department of Mysteries of the Ministry of Magic, Lao Fu accidentally fell into some mysterious substance and was turned back into a baby (I remember this thing in the fifth volume) in order to protect Xiao Ha. Lao Fu has lost his memory and is a real baby version of Tom Riddle. In order to protect little Tom, Harry and some insiders concealed the truth and announced to the public that Voldemort was dead. Little Tom was adopted by Hermione and Ron, who were newly married, and became Tom Weasley. Harry went away to a foreign country.
Warning: SE (sort of). Short and medium stories.