Harvest Moon by Delilah Devlin

In Jefferson Parish, deep in the bayou, is a place called Bonne Nuit. Off the beaten path, isolated by swamp and connected to the sea, there the Beaux Rêve Coven thrives.
Five witches…Too many demons to count…
Radha’s sister witches become concerned when her health begins to fail. Her sleep is never restful, but they are unable to pinpoint what is wrong.
Khan, a jinn who’s been tasked to serve as her guardian, has watched her restless sleep and believes he knows the answer. Her dreams may be haunted by a demon set on draining her of power. As much as Khan loathes the idea, he seeks an old enemy, a vanir, whose magic should allow him to enter Radha’s nightmares to slay the Mare, an enemy bent on taking advantage of Radha’s vulnerability to make her his own.
Until the vanir arrives, Khan and the satyr who is her other guardian must keep her safe–even from their own lustful natures.