You are pony dragon hybrid but you don't know that until now when you started glowing. You remembered that your father injected you with dragon blood. Years pass you are 20 years old but your are starting to feel the effects of the injection that your dad gave you.

One day when you were walking you started to glow. It was strange for. You were at home when this happened

You decide to visit princess Celestia about it. It was there you found out you were part dragon.