So, I've just finished the last questline remaining in Vvardenfell. (Started playing the game just about two weeks ago so I'm a bit late with this, I suppose.) You probably know the one - the story of Sun-in-Shadow and Eoki. Make no mistake, I've greatly enjoyed all questlines of the expansion but this one in particular absolutely broke my heart and touched me to the core. The writers captured perfectly what it's like to grow up with heavy-handed abuse and internalizing it to the point where you not only accept all the wrongs done but actively believe that if you "just do better" things will change. Although the ending wasn't what I'd call a happy one, it was certainly realistic. Again, excellent writing. Many kudos to the ones responsible for this.
What are your favourite story moments in the game? Doesn't have to be a quest. Could be a book, a short note scrawled down and left behind in the middle of nowhere, or even just an overheard dialogue that you think is memorable. As an example, I found the book "Dark Elves, Dark Hearts" to be quite... something.
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SEES-NO-SENSE
ARGONIAN WARDEN