Pink To Mameshiba
A part-time teacher Shiba has become a major idol otaku since he's 15, aka 'Mister Pre-order Everything' at the store where his student Kurokawa works & blackmails him.. "Shiba-chan, From today on, be my dog.. Your response?" -- *Ruff* σ(≧ε≦o) ≫➤ Blackmail plot but in a funny kawaii theme.. The teacher Uke's so naive, cute & kind..
Meguriau yo, Baby
Yoshizawa Kuuya, a high-schooler, grew up in a single-parent family. Because his mother was an unpopular actress, he had to work part-time as a pizza delivery boy. While making his delivering one day, he accidentally met a gay couple arguing and one of them was his sensei, Kakei Yuuichi. After that, they started to get closer. Was it a coincidence or a destiny? Don't Cry Baby (Sequel)
Lock You Up
If this is not completed by the time I read this then go to mangadex where it is complete. Ordinary high school student Lu Qing Yu and the elegant university teaching assistant, Cheng Jing. Their encounters was definitely not by chance or just a coincidence. Due to their previous generation's old grudges and grievances had made them unable to live tranquilly and peacefully. He, who took great pains and had ransacked his brain over trying to make the star fall from the sky, but was enthralled and mesmerized by the star instead; The other him who was ignorant, trusted him wholeheartedly and faithfully, staying completely oblivious to the fact that this was all just a trap meticulously and carefully designed especially for him...
Sensei Wa Sonna Koto Oshietenai!
Blackmail and groping not addressed or apologized for
Suki ni Nattara Dame desu ka?