Alpha Dragons by Jasmine Wylder

The war between the Dragon Kingdom of Aera and the Sea Dragon Kingdom brought a curse that no one could escape from — Not even Naydra Stoneheart.
She was a tough wyvern shifter who would soon be sent into the active war zone after four months of Academy training. Leaving the Royal Court for the Academy had felt like her heart being ripped out, but little did she know that big adventures awaited her there.
The curse wouldn’t let any man or woman take the place of Dragon King and Queen without their respective fated mates or they would face death. Naydra never expected her Soulmate Scale to glow blue when she defended Seijan Silvertongue, another Royal Court foundling, against Ardmok.
It was proof that Seijan was her fated mate, but that realization was short-lived when Seijan disappeared, leaving Naydra shattered to the core.
She never would have thought that the ordeal would bring her closer to her worst enemy and the biggest bully, Ardmok. Their connection was perplexing, especially because he had intentionally tried to harm Naydra.
The blue glow between them was only the beginning of Naydra’s newfound troubles when she was faced with an impossible choice. She could leave the Academy and back out of the war or stay exactly where she was while avoiding Ardmok.
Her decision would not only change the course of her life but also affect her efforts to find out what really happened with Seijan.