Toki Watari Reijou wa Reiketsu Ryuuou no Chouai wo Towa ni Kizamu

A reincarnation isekai fantasy where a ruined slave's soul burns with desire for the Dragon King. Himiko Midou, the daughter of a CEO, had been abandoned by her fiance. Twice, in fact. "What's wrong with me?" One day, she tries hypnotherapy and discovers the karma of her past life. Himiko was once a slave kept by the dragon king in another world. She was bound to him, yet showered with gentle love each day. She wanted to believe that he was her soulmate as he passionately penetrated her. However, her life ended in tragedy when she was killed by the same master to whom she had dedicated her body and soul. Knowing that this is why her love life hasn't gone well, Himiko returns to her past life to change her future. (Source: BisouBisou Comics)