Manga by author Kumagoroshi - Status ongoing

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"If it's you, I don't mind doing it with a man." In a world filled with Alphas who have special demon powers, Hibiki is an omega who has the power to turn into a demon. He hides his identity and is on a mission to defeat monsters. Masato, his junior who can also turn into a demon, is a playboy and they don't get along well. One day, during a mission, Hibiki suddenly gets into heat and Masato finds out that he's an omega...!! "Ah, sorry, I can't hold back any longer." Masato shoves his hot di** into Hibiki's wet bu** by force. A BL story between a younger alpha and confident tsundere omega who are on very bad terms!