The sequel of "Night Milk Heads" (main story) Yamato Mamoru x Kawase Motoki
Cute, fluffy, and way better than the first story in every way. Much better art, cuter relationship development, more depth to the story, less plot holes. You might be confused if you didn't read the first story but honestly I wouldn't recommend reading the first one. Unlike the first one, this is going on one of my lists.
Night Milk Heaven