Burn Her They Said by Cherish Wright

Imperial Grand Witch Tasch is an Anomaly, born with the strongest emotional influencing magic for which the Emperor requires, entrapping her to manage his temper under threat. Valuing her magic above all others, he assigns five sorcerers as her Imperial Guards. All Anomalies, wielding the strongest magic in their individual forms, who forge an alliance with the hope to free every citizen with the aid of their bonded Dragons.
One sorcerer changes everything.
Varic’s magic surpasses that of Tasch’s Lead Guard, infuriating the Emperor who forces him to serve in the Imperial Army where Varic is commanded to strengthen his magic beyond his control, resulting in the worst magical catastrophe in history. After which the Emperor sends Tasch to rehabilitate Varic, believing her magic alone can heal his grief. They forge a strong connection away from the eyes of the Emperor, and fall in love, which aids in Varic’s healing. A love so forbidden, they must hide their affection, for the consequence of it being discovered is unlivable.
Bordering lands’ increase their attacks on the Imperial Palace, requiring resources the Emperor hoards, which prompts him to appoint Varic over Tasch’s detail—increasing their need to hide their feelings for one another, as well as all signs Tasch’s magic is fading. Culminating when the citizens demand the Emperor to name an heir, which he refuses in lieu of believing the Imperial Grand Philosopher to be close to discovering the secret to immortality.