Forever Destined To The Silver Shadow

I tried to walk away from him, but he grabbed my hand and froze me. I felt ecstatic as soon as his hand touched my skin.
“Come to me, Celestia,” he whispered. “ Be mine. Let us rule the realm together!"
I wanted to resist my temptation, but I wasn’t able to do it. I turned to him and stared at his mesmerizing sea-green eyes. He looked so divinely handsome. 
He wrapped his arm around my waist and pulled me closer to him. His hypnotic gaze had the power to control me completely. I wondered how someone could have this much alluring power. 
“ I want to be yours, Silver Shadow,” I confessed to him.
Dimples formed on his cheeks as he smiled at me, and now he appeared to be even more gorgeous than he did a while ago.“ You made the right choice, my love," he said in a deep tone and pressed his lips with mine. 
At that moment, I completely forgot about my true purpose. It doesn’t matter anyway. I belong to him now!
It is impossible to resist the charms of the trickster Silver Shadow! He is strikingly handsome with an angelic face and chiseled physique. He can captivate anyone when he plays mellifluous music with his harp and sings with his deep baritone voice.
He is power-thirsty, and his only desire is to overpower the Fae King Oberon so that he can become the King and rule the lands according to his will.
But his desire changes when he laid his eyes on the Angel Warrior Celestia. After that, his biggest desire was to own her!
But Celestia is meant to be a maiden warrior and protector of her realm. Since she has the powers of an Angel, she is stunningly pretty. Everyone else in the realm worships her like a deity, but Silver Shadow wants her for himself.
Silver Shadow succeeds in luring Celestia to the dark side, and she falls prey to his enchantment. He tricks her into taking the Oath of Eternity, and by her oath, she becomes forever destined to him.
As Celestia fails to fulfill her actual purpose, the Fae King banishes her from the realm and curses her to become a Half-Vampire in her next birth. 
After a thousand years, Celestia is reincarnated in the mortal world as a Half-Vampire. She is unaware of everything that happened to her in her last birth until she is twenty-two years old.
Celestia is transmigrated back to her realm, and soon she realizes the truth about herself. She pledges to destroy the Silver Shadow, who she assumes is the reason for her misery.
How will she be able to subdue her enemy when she is destined to live with him for all her eternity