Fire and Water by Kiernan Kelly

After centuries on the run, the only thing Jann, a fire djinn, wants is to do is to live quietly in Valleywood, and operate his pride and joy – his Firedancer Food Truck. He doesn’t count on meeting and falling for Uisces, an Irish kelpie. In this case, fire and water do mix, as the two fall madly in love despite their innate differences.
The past rears its head and threatens to tear them apart when Urdu, an evil djinn who has stalked Jann for centuries, finally catches up with him.
When Valleywood is burning, only Jann and Uisces can save it. But who will save them?