My Magical Demon Lover

Tristan dreamed of being a wizard his entire life, but has no idea what it will cost him. He's the great grandson of the wizard who protects his village and the first one to show any affinity for magic in three generations.

After waiting fiveever for his great grandfather to take him as his apprentice it's finally happened! He's been summoned up to the tower where his great grandfather watches over the village. But it's not what he expects...