My first thought was the art was like Gochuumon wa Usagi desu ka? Then I thought, Chino and Cocoa both have this doujin, but they hope the other girl doesn't find out. Then one night, Cocoa hears Chino yell, "make me clean, Onee-chan!"
What a joy to read this was, like a slice of strawberry cake on a platter. And the Lots of Sex/NSFW tags were the cream on top. Hope we will see consistently more content with the Holy Tag Trinity in the future.