Diary of Darkness by Arabella Holmes

Born with a severe facial disfigurement, 21-year-old Alex Kingswood has spent his life locked away from society on his wealthy parents’ country estate. He has never had any friends and longs to meet that special someone to share his life with.
Jessica Gardner is a girl from the wrong side of the tracks. Desperate to pay off her beloved mother’s medical bills, she reluctantly joins an escort agency and agrees to auction her virginity to the highest bidder.
When the victor turns out to be Alex Kingswood, it sets off a terrifying chain of events. Once Alex has had a taste of Jessica, he simply can’t get enough and wants to keep her forever and ever. He will stop at nothing to possess her and woe betide anyone who gets in his way.