I Became the Cure for the Mad Emperor

Helios, the Emperor of the Empire, suffered from mana frenzy upon awakening as a Sword Master. His sole objective was to quell the boiling madness within him. To achieve this, he began a campaign to subjugate the continent. And at the end of that conquest, it seems he picked up something interesting. To cure the mana frenzy that torments him, he treats Edel, the king of a fallen nation, as a toy to be manipulated and rolled around exactly to his liking... “I... I love you.” The brat who is nothing more than a cure confesses his love. Is he out of his mind, considering he's just a slave? ---EXCERPT--- “Ah, hngh! Too, too fast, ahhh!! Aaaah!” Having obtained what he wanted so easily, the...