"Oh, rather." Susan doesn't think it's a secret - and, indeed, in just a few nights hence, Lancelot will kiss and then carry Laertes physically from the bacchanal in front of all attending, so even if it is, it shan't remain so for very much longer. "He's being awfully respectful about it, too. Perhaps a Speedo situation might inspire them to put an end to all that rot."