S&S Read-Along: Ch. 11 & 12

Boy, things are escalating quickly between Marianne and Willoughby, aren't they?  By the end of chapter 12, they are calling each other by their names without the words 'miss' or 'mister' in front of them.  That's huge.  According to the notes in my copy, that would be seen as tacitly acknowledging an engagement without formally announcing it yet.  (Now, Elinor and Edward do sometimes refer to/address each other by their first names, but that was allowed because they were sort of in-laws, since ...