Valar has blessed Elrond, Lord of Rivendell, with two sons: two twins. It's very rare between Elves for twins to be born, and they are beautiful.

The twins have grown to be two beautiful Elves, tall and with a feminine body, like every Elves. And, thanks to their beauty, Elrond managed to form the most important and powerful alliance he could have hoped for: the Dragon Rim.

The Dragon Rim is a rich realm, maybe the richest of all, where its people are tightly bonded to dragons/wyverns, with which they keep a long-life bond.

And you are polygamous.