In Her Element. Elementals, #1

Darya Drake is a Water Elemental who has lived a difficult life. She's raising her younger brother, Matthew, who is mentally ill, and she has had to fight off Phages-Elementals who kill and cannibalize other Elementals to steal their powers. It isn't until she meets Ethan Zale, a Water Elemental with stormy blue eyes and a body to die for, that she dares to hope for a better future. Ethan is everything she has ever wanted, but trouble looms when a Phage begins stalking her.
Can Ethan find out who is after her and keep her safe? Will her brother accept another man in her life? Darya discovers true love in the midst of strife, but for a girl who has lost almost everyone she has ever cared about, it's hard to believe in happy endings. Content warnings: reference to past abuse, reference to suicide, some violence, love scenes intended for adult audiences only, merman sex