Unholy: The Beginning by Natasha Knight

Monsters don’t hide in the dark.
When I met Damian Di Santo in a dark corridor of my family home I knew he was a monster.

I was a scared girl.
He was already a man.

That was when his twisted countdown began.
Marked by dead roses with sharp thorns, eight years passed each bringing me closer to becoming his. Until the eve of my eighteenth birthday.
That was the night he returned to claim me.