I'm stealing my own adoptable plot for Willa's background flavor. She has started letter correspondence with ~2-4 gentlemen over the past two years. From her history:

She does find herself flirting with a few gentlemen who are imminently departing for various places — a tour, a business trip, something or other she still doesn't understand in America — and starts some voracious (but secretive — she doesn't want Mama to get too excited when these gentlemen might never return) letter correspondences. Writing letters to suitors is easier than actually talking to them, in some ways — they are less disappointing than in-person suitors when she only hears from them every few months and only hears what they choose to share.

also if you start it she will totally send you VE sexting mail

These can be existing characters or combos with other ads. They need to be someone she could feasibly have met at season events (MC/UC, human-ish, etc) but do not need to be marriage material. She's mostly in it for the ~escapism and to give her something to fantasize about at night. What YOU are in it for is up to you!

This could become:
- you return and want to marry her and she's - shocked but flattered and maybe let's do it?
- you return and want to marry her and she's already ~involved with someone
- you return and don't want to marry her and she's not exactly heartbroken but she is a little offended, what the fuck?
- you use some salacious letters she's sent you in the past as blackmail
- something else entirely!