Mashou Hime Tiruana Haramase Saimin: Ningen o Shiitageru Mazoku no Hime ga Anji Hitotsu de Niku Gangu ni Naru

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The protagonist was treated like a slave in the demon army; now he has attained sorcery. Demon Princess Tiruana will pay for her oppressive ways by his mystical hand. Once her human garbage, he is now her controller; he deceives, manipulates and enslaves her just like she had enslaved him! The second stage of life is different for them both.

Source: IGDB