The Brothers Bane by Ophelia Bell

Thrust into a world beyond her understanding, Nemea Jones struggles to come to terms with her newfound powers of chaos. Believing she finally understands where she belongs, she gives into the inexorable desires to surrender to the monsters and gods alike who guard the depths of Tartarus.
But when she learns that the place she hoped to call home is no more than a prison for her too, she begs the only guard who can leave the place to help her escape.
With the threat of attack from four angry Titans looming, the pressure is on for the warden of Tartarus to find a way to beat them and return them to the prison. But his secret weapon is in the wind, stealing his heart in the process. It may require all his and his brothers’ considerable power to find her and return her to the place she belongs by their side.