For a thousand years, the dragons upheld their pledge as Deos' servants. Their service impressed Deos, and he saw fit to reward his dragons accordingly.
Over the course of a thousand years, Deos' first, and greatest of his mortal creations, the dragons served him better than he had hoped. The devotion to their creator outclassed even that of his direct children, the Eternals. He'd reward their hard work soon enough, but the sheer determination of the dragons simply cannot be ignored. He'd reward his servants with servants of their own.
He put all of his dragons into a deep sleep. From their backs, he took the two rear wings of every single one. With those wings, he crafted his first bipedal, (as he described) humanoid beings. Because they were crafted from bits of the dragons, they all had draconic features. A head that resembled that of the dragons, complete with horns. Scaled skin, narrow, vertically slit pupils in their eyes, legs that resembled the dragons' hind legs, and a breath weapon. The males would breathe fire, while the females would breathe ice, much like the dragons from which they were made.
He used this opportunity to test numerous features that would be a part of all future humanoid beings. Such as a humanoid method of live birth, mothers feeding their young with an acid that would strengthen their digestive, and immune systems. He made the draconin to serve, and therefore, made them large, broad, and strong. Much like the dragons, he gave them the ability to comprehend things like music, art, and love.
When these beings awoke, the first thing they saw were the dragons. Instantly, they felt attached to them, and felt a connection like no other. The dragons make known to this new race their title, being the dragons. The new race was able to instantly connect the dots, and knew that they came from these dragons. They called themselves "Draconin" in their tongue, meaning "Born of dragons."
Before these draconin could swear themselves to the dragons, from which they were made, the dragons instead swore themselves to the draconin, viewing all of them as their children. The argument the draconin used as "As children, please instruct us, let us serve you." Lovingly, the dragons agreed.