Sentinel of Khoth by Brenda Trim

Talysia, a siren halfling, has been an outcast her entire life. She’s moved too many times to count, searching for somewhere to call home. She travels to the dragon realm of Khoth and immediately falls in love with the simple lifestyle of the mystical realm. She is drawn even deeper when she meets Finn, a sexy dragon knight, and imagines herself finally settling in one place. Unfortunately, her bliss quickly morphs to terror when Talysia finds herself in the middle of a brutal war between the dragons and their enemies? So much for the simple life.
Finn, a formidable dragon knight of Khoth, does everything in his power to protect his king and queen, as well as, the Cuelebre citizens. When duty leads him to the captivating Talysia, a half-breed siren, their instant attraction burns soul deep. Her tempting curves and irresistible voice incite him like no other, and for the first time in his life, Finn imagines placing his mark on a female. And then the shitstorm hits.
Cyril, the evil Unseelie King, ups the ante in his war against the King of Khoth, and Finn vows to defeat the vile male threatening to destroy his realm and those he loves. To make matters worse, fate takes a nasty turn and the Cuelebre Queen and the heirs to the throne become sick from an unknown source. Battling the hands of time, Finn fears what the future holds for his homeland, its people, and the female that has captured his heart.