Memories in the corner of my mind, oh those different memories of fic I cannot find

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Draco collects memories of people having sex. Finds out people dressed up like him and Harry are selling memories fails to amuse him. Manages to get Cho to give him a memory of her and harry, is noticeably upset, Draco hands over memory without protest, Harry gives Draco A better one. If I really need to go on then you obviously have no idea which fic I'm looking for. Much thanks.