Keeper of Crimson Petals by Winter Lie

To be a Keeper was to dedicate one’s life – and heart – to protecting another.

Jasmine wasn’t ready for it. Less than a year into her training at Sanctuary, a college for Keepers and mages alike, and with a fresh start from a brutal life of thievery in the slums, all she wanted to do was continue mastering the sword arts and avoid her other responsibilities.
Those plans are ruined when she’s assigned to be the protector of a young nobleman whose family was murdered. Her new charge is cocky, smug, and drives her up a wall at every opportunity. Forced to protect a man she can’t stand with her life, Jasmine needs to find time that isn’t there to continue her training and keep assassins from killing both of them, all the while learning magic and discovering that there’s more to life than survival.
And yet, Jasmine starts to find herself inexplicably drawn to him. In the slums, Jasmine never had room to care about anything other than putting food on the table. But she’s not in the slums anymore, and she can’t keep her feelings tied down forever.
Unfortunately, burgeoning love is the least of Jasmine’s problems. As pieces of a malevolent plot start to unfold around them, she and her charge realize that there might be only one thing left that they can rely on.

Each other.