Bonds of brass - Emily Skrutskie

Ettian Nassun's life was shattered when the merciless Umber Empire invaded. He's spent seven years putting himself back together under its rule, joining an Umber military academy and becoming the best pilot in his class. Even better, he's met Gal Veres-his exasperating and infuriatingly enticing roommate who's made the Academy feel like a new home.But when dozens of classmates spring an assassination plot on Gal, a devastating secret comes to light: Gal is the heir to the Umber Empire. Ettian barely manages to save his best friend and flee the compromised Academy unscathed, rattled both that Gal stands to inherit the empire that broke him and that there are still people willing to fight back against Umber rule. As they piece together a way to deliver Gal safely to his throne, Ettian finds himself torn in half by an impossible choice. Does he save the man who's won his heart and trust that Gal's goodness could transform the empire? Or does he throw his lot in with the brewing rebellion and fight to take back what's rightfully theirs?