Ai Suru Tsuma no Ana wa Tanin no Ana Datta... ~Bishiri o Sashidashi, Aniki no Nikubou o Onedari Suru Midarazuma~

Shinomiya Hiroaki is living a lovey-dovey life as a newlywed with his new wife, Yuzuka, who he just got married to the other day. He received a message from his older brother Ryuuichi, who is working as a freelance writer overseas, that he would be returning to Japan for about a month. There's no point in renting a house, so Hiroaki suggests that he live in his own house for a month or so. This is how the three of them start living together.