I forgot the title of this yaoi!

In the beginning, there are 2 males who are in middle school that always do it in their dorm room, and their are these other 2 older males that are in high school always watching them from their own dorm room. Then the 2 younger males become high school students and the 2 older males want to claim them for their own.

I'm trying to find this yaoi again for a friend ^^

Kohitsuji Hokaku Keikaku! ?

oh thanks so much!! <3