The Dragon's Revenge

Scarlett Agnos, heir to the land of wisdom and nature - Sophos - and the troublemaker. She's destined to be queen to a man and be obedient, submissive and meek. However, that's the opposite of this girl.
Orion Richard, heir to the land of battle and war - Bellum - and the talk of the land. He's destined to be the king, and he's clearly ready for it with brawn, brains and clear good looks. And well... his mother has a disease.
Dragons exist, roaming the land and caused chaos amongst the two lands. The two founders of the land, long ago, agreed to take turns and provide sheep for the dragons to take. This has been going for generations, every full moon.
But the food is scarce in Sophos, the dragons are angry, and the land is turned to flames.
Everyone is dead, not a single survivor left except the heir, Scarlett, only 16 to provide for herself. She is furious, and vows that she will kill the dragon - the Draco - who set her father to ash.
But Orion has made peace with the dragons, and they are friends with Bellum.
Now, she has found Orion, who rides the Draco as a friend and loyal companion, ready to kill the dragon once and for all.
But will she kill the dragon and create her revenge, or fall in love with Orion, her enemy, and give up?