Fics like Royal Chains

Prince Daichi, heir to the Karasuno throne, is determined to end the systematic mistreatment of male omegas in his kingdom. When he learns his proclamations aren't being enforced, he tasks his advisor, Kuroo Tetsurou, and closest friends to uncover an illegal omega smuggling ring occurring under their noses. Amidst the chaos, four omegas are rescued. Their testimonies are critical to unveiling the truth about omega smuggling and abuse of power within the castle walls, but someone is determined to make sure they won't testify. (Also they fall in love with the alphas that protect them and it's adorable.)

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