Wait! Where are the Miki x Yuki, Miki x Yuuri, Kurumi x Miki, Kurumi x Yuki, Yuki x Yuuri and Megumi x Yuki tags? Why not? Gakkou Gurashi is a gold mine of yuri yet to be discovered.
Btw, I wished MeguYuki would get a very happy end. Sure, I still don't fully support student/teacher relationship but then I realize there are time where the age gap is only of 5 to 6 years so these are fine (as long as it's yuri, that is).