Eighteen-year-old virgin Ava Thompson is left with nothing when her father vanishes, except a $2.5 million debt to the most ruthless billionaire in the city—Mason Carter, her best friend’s father. The night he comes to collect, Mason offers her one way become his for thirty days. Body, mind, and every untouched inch of her. One signature later, Ava is moved into his glass-and-steel mansion, stripped of clothes, freedom, and choice. What begins as cold repayment quickly turns into dark obsession. Mason doesn’t just want her submission—he wants to own her completely. Night after night, he trains her, marks her, ruins her for anyone else. And night after night, Ava discovers she was never running from him… she was running to him. A full-length, standalone dark billionaire Daddy romance loaded with possessive alpha, age-gap, praise kink, and total power exchange.