I loved all of them, but damn, the last one captured my interest. I don't like threesomes/sharing their partners to others, but boiiii the last part of Chapter 7 was so interesting, the twist was amazing. (To Author) Is there a manga for itself? Or would you be making one? Hopefully if there isn't, please do make one, I really wanna see more of it. BTW, amazing works, author!
Seito No Shuchou Kyoushi No Honbun