THE VIRGIN’S SECRET (Harlequin comics)

Angel is a waitress working at an extravagant welcome party for Leonidas, the next head of the famous Parnassus family. She's on pins and needles, hoping that her identity as the daughter of the Parnassuses’ archenemies won't be discovered. Unfortunately, her plans to keep her head down are dashed when she catches Leonidas's eye, and nearly ends up kissing him... She's able to escape his advances, but is later caught red-handed sneaking back into the estate to return a document stolen by her father. Instead of pressing charges, Leonidas has a request: "Become my mistress."