Zero no Sekai de Hana to Odoru

Abandoned as an infant at the gates of Viscount Irino's estate, Asahi was taken in and raised alongside Touri, the viscount's own son, the two boys growing up as close as brothers. For young Asahi, Touri was nothing short of his entire world—his constant companion and the presence that made the grand household feel like home. Years pass, and Touri blossoms into a striking young man, admired for both his beauty and his refined character. Yet despite his elevated standing, he has never once changed the way he treats Asahi, offering the same easy warmth and affection he did when they were children. Asahi, keenly aware of the gulf between their stations—and of how improper it is to want more from someone he regards as family—keeps his longing buried deep. Then one night, Touri attends a party hosted by a noble family and returns home in a dire state, his body aflame under the effects of an aphrodisiac given to him at the gathering. Asahi knows full well that he is the last person who has any right to lay a hand on him. But with desire drowning out reason, resisting temptation may prove impossible.