I put this into the "Sera" thread, but I thought it fit well here too. Note: Sera is merely a fan nickname I had heard before. Since calling her "Blonde Elf Girl" all the time was getting awkward, I figured I'd go with the fan name for now.
I had gone with the idea that Varric told Sera about the Elder Tree. I did one little bit where Sera just about makes Cassandra's face turn purple. This is my idea if she tried to do this with Vivienne.
More fun with the Elder Tree, Part 2! I'm not going to write it with Vivienne's accent, so use your imagination.

Sera: A lovely young lass for me to see. What brings you here to the Poet Tree?
Vivi: I do not think you wish to do this.
Sera: Nonsense, with my little rhymes I love to play. Come, join me on this fine and lovely day!
Vivi: Very well then, since you insist my dear.
Sera: <squee!>
Vivi: I know this game of rhymes you seek. 'Tis not a game meant for the faint and for the weak.
Sera: Show me what you can do. Do you have more wit than is in a shoe?
Vivi: Let us begin.
Vivi: I see a young elf so full of humor and sass. I would be too, if I had no chest and a flat ass.
Sera: Wait, what...
Vivi: Your hair is like brittle straw, though I am sure men in the dark do not see that fatal flaw.
Sera: Hey, hold on now...
Vivi: Now now dear, it is only for a laugh. I can smell you from here, so please do take a bath.
Sera: WHAT?!?
Vivi: What is the matter with this little game? I told you I would win one and the same.
Sera: Wait, but I have...but I didn't...just one second here...hey!
Cass: <doubled over with laughter>
Varric: Ah, Madame, you never cease to amaze me. Shall we be off, everyone?
Vivi: Oui. Little Sera, it was much fun. We should do this again sometime, no?
Sera: <mumbles something not nice about Vivi's mother>
Vivi: What was that, dear?
Sera: Nothing.
Nap time, have fun guys.
