Tutoring for the Vulgar Brother

※ Please be aware that this novel contains forbidden relationships, coercive relationships, and elements of yodofu.※ Yoon-hyung, who had always been a thorn in his side, secretly called a male prostitute without Yoon-hyung's knowledge. He's annoying enough as it is, and now he's calling male prostitutes behind my back! Yoon-hyung couldn't stand his brother, Yoon-joon, any longer, and decided to teach him a lesson he wouldn't soon forget. "I never knew my brother was a homosexual." "Younger brother, this is... Ugh!" "Does that woman know? That you, an omega, are calling a man for such acts?" Yoon-joon's flushed and disheveled appearance was revealed, and Yoon-hyung, aroused by his brother'...