Jars of Clay by Lee Strauss

She is the master's daughter he is the son of a freedman any interaction between them is forbidden but love? That's punishable by death. At least for the boy, she'd just be married off. A fate as terrible if not worse. This is the destiny of Helena and Lucius. For they have done what the must not they fell in love.

A historical fiction that switches POV between the lovers and a few of the other characters. It is a short sweet story a few inaccuracies as far as the history goes but a good story none the less.