Asou Mizuho manga
From Blissful Sin: Yuuta lives together with his two step-brothers, Tomoaki and Takayuki. But their life together is far from a quiet one. So what happens when Yuuta gets angry one day because Takayuki won’t stop sticking to him? And how is Tomoaki involved in it? A story about a not so innocent brotherly love!
From Aarinfantasy: The young Yamato Yousuke searches for a way to follow in the steps of his father, a detective who passed away in mission trying to save a little kid who got kidnapped. Finally, an opportunity to become a detective himself has arisen, but in the middle of carrying out his first assignment, a test to see if he would be a good detective, Yousuke suddenly gets hired, apparently for no reason. There must be a secret behind all this...
From Blissful Sin: Yasukado and Yasutoki are twin brothers born as the heir and protector of their family's feudal household. When an assassination attempt is made on Yasukado, Yasutoki must do all he can to protect his beloved brother and lord.
Keito, a high-schooler with an odd love of plants, finds a cosplaying babe in the garden. The babe in question is Roze, the reigning King of the Plant Kingdom! Roze is on the verge of extinction due to the lack of human affection. Only sex with Keito can restore his energy reserves and as Roze's kingly gaze heats up, Keito finds himself strangely compelled. "Join with me," Roze says. Why, the audacity of royalty!