I Turned Out to Be the Mother of the Dragon Duke's Twins

Five years ago, Allison was drugged and spent a night with Duke Jasper, leaving her pregnant with twins. Her stepmother falsely told her the babies had died and walked away from them, but Jasper quietly rescued the children and raised them. Four years later the twins track Allison down, and she and the Duke agree to a marriage bound by contract. Her stepmother Marian then sells Allison to a dangerous man, and Jasper steps in to save her, revealing a dragon mark that hints at a hidden bloodline.