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!

1-3. Hana Sakasemashou (Let the Flowers Bloom)
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.
- Blissful Sin

4. Futago no Goshisoku-sama
An alternate story of Yasukado and Yasutoki in a modern world.

5. Suki ni Nattara!

1-4) Barairo Emperor
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! (from Blissful Sin)

5) Kiss Shite Master
One day, History teacher Imazato finally recieves the robot maid he mail ordered weeks earlier. But the wrong robot is sent by mistake, and Imazato finds himself the unexpected owner of a HIMO-TYPE robot designed for single working women to be the ultimate prince charming. Imazato isn't sure how to deal with this robot constantly invading his personal space.