You were born at a prestigious, wealthy, and well-known family. Your family is rich in pasts and histories. You guys never ran of tales to tell generations after generations of all the achievements your family has received.

One of these is the enternal, ever-lasting dragon, who swore to protect your bloodline, Endymion, the greatest friend of your bloodline. Endymion was a timid one. His goal and focus were clear, focusing to protect only your bloodline. He is held down generations after generations. Now, your father, the King, was the tamer.

Eventually, your father tragically died, leaving Endymion to choose another tamer/owner of his. And he chose you.

You always wanted to meet Endymion. Endymion's current form was a human. His true form was only revealed during crucial times.

You treated Endy like a friend. You played games with him and showed him the items you get from doing expeditions and training.

He did nothing but listen (I guess) and nodded everytime.

Though cold and distant, He came to genuinely like and care for you.