Boy/man beautiful art love adult

From Fantasy Shrine:
Your flowers are lifeless accuses the world-famous flower artist, Hikawa Naoki. Facing such merciless criticism, Kaede, heir of the prestige Akizuki flower arrangement school, has never been more humiliated in his life. Thinking his younger twin, Momiji, is more blessed with love and talents, Kaede reluctantly agrees to go to Hikawa for inspiration. However, under the elegant, masterful instruction of Hikawa, is a lesson of love disguised in seduction! And Kaede

Even before he was born it had been decided that the heir of the Haku Family, Reion, would be betrothed to the youngest child of the Koku Family, Kaen. For his coming-of-age and wedding ceremony, Reion visits the House of the Koku Family. However, Reion was no longer the boy he first saw in pictures, but a man overflowing with confidence. Furthermore, Reion left the words "I am as appalled as you are about this wedding between two men."

From Hochuuami]:
Prince Ashide decides to agree on a wife, but too bad for him a lone deserter of the country of Ishugal shows up instead to claim the title of Princess.

From Dangerous Pleasure:
After a fallout with his father, Alvin takes time off to visit India and indulge in his love of exotic places. When he meets Razil, it's love at first sight and the two of them return to England as lovers. But Razil has a dangerous past in India that Alvin knows nothing about.

Kinnen is a son of a famous prostitute, when his mother becomes sick, he sees no other way to survive than to become a sex toy of a rich Chinese noblemen, despite the protests from Bushou, who loves him. Years pass; Bushou has not forgotten about Kinnen.

Yaoi romance in France's Ancient Régime.
#1 - Otona no Kiss (Adult's Kiss)
#2 - Amakute Kiken no Himitsu (Sweet and Dangerous Secret)
#3 - Itoshiku Tsumetai Kimi (Beloved Cold You)