The Poor Merman Was the Real Heir

My sister chose the rich heir. I got the penniless merman. She thought she won. She didn't know—he was the real Kensington heir. The man beside her? A swamp monster wearing a stolen face. Now she's living my nightmare, while I'm plotting to reclaim everything. But this time, I'm not saving her. She poisoned me once. She'll learn—some bargains are worse than death.