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Having an NPC write a love letter sounds to me just like having the guardsman tell everyone how it is his last day on duty and he can't wait to retire to sit on the shore of his favourite lake and fish in peace.
Would be a shame, if something... happened to them.
In my Call of Cthulhu campaign, a character received a cathartic, romantic love letter from his long-distance sweetheart NPC. And then the PC was killed in one shot by a sniper in the next episode before being able to write back.
It's a lot. The dice are cruel sometimes in high-lethality systems but it's made a great tragedy for the other party members- they have to share the bad news when they get back to town, and that's some juicy horror/drama roleplaying.