Lord Hervey/Algarotti, which, if the muse strikes, might enable me to get a story about the triangle with Lady Mary in. Or just a story about Lady Mary and Algarotti in their final years in Italy meeting again, reminscing about Hervey, and with her quizzing him about Fritz (and teasing him about the fact he writes poems for both Fritz and MT, just in case, since this is during the 7 Years War). (Hey, if it's a crack fic, one could mention him posting the wrong poem to the wrong monarch.)