I Married This Dragon King Instead of My Sister

In her previous life, the human princess Seraphina pursued the dragonslayer Cassian so fiercely that she forced him to wed her, even though his heart had always belonged to her younger sister. The resulting war brought the kingdom to ruin, and Cassian died begging never to lay eyes on her again. Seraphina perished in the flames vowing never to cling to him again. Reborn on her wedding day, she makes a bold new choice: she hands Cassian over to her sister and offers herself instead to a ruthless dragon king.