Step 1:
Get an Exceed
Step 2:
Use your Exceed to fly right above a dragon's head.
Note - The dragon needs to be attuned to your own element.
Step 3:
Let the Exceed drop you on top of the dragon's head.
Step 4:
Proceed to eating the dragon.
Note - during this time, the dragon will thrash about to knock you off. Hold on for dear life.
Step 5:
Continue eating the dragon until the dragon feels an immense power and presence from your small frame.
Step 6:
When the dragon asks what you are, reveal that you are the son/daughter of the dragon king of that elemental power.
Step 7:
???
Step 8:
Profit!!!