There is a whole lotta griping about sensei and a whole lotta sensei why can't you just treasure and cuddle dear sweet Midori. That is not who sensei is. If he became sugar sweet Midori would wonder if it was an alien that looked like sensei.
Did he go over the top in this chapter, yes. He is going to need to find a way to repair his relationship with Midori, yes. Did Midori do something wrong, yes. At least from sensei's point of view. Sensei has made it clear from the beginning that he wanted Midori's Everything. Then Midori brings another man over during the little bit of time the could be together. Someone sensei has already wondered about their relationship. I can totally see where sensei is coming from.
Sensei wants to own and dominate everything about his lover. Midori needs to decide if that is what he wants for himself. If he doesn't he needs to cut it off completely.
To get your certificate, what kind of exam must you take? I understand that Japan takes it certification process seriously. I am certain that it is quite extensive and long and exhausting to sit through successfully. And even then you would need to level up. Who wants to be a second class pervert? ╮( ̄▽ ̄)╭ first class all the way baby.
In this kinda situation it is important to hunt down the bastard and make sure he is dead. Not mostly dead, you can recover from mostly dead. But very dead and hopefully very bloody. I am not saying that you should seek revenge. I am saying that some people are like rabid animals and for the good of all they should be put down. The evil they carry inside them they infect others so it spread worse than a disease.
I don't think the seme is doing this out of hatred. I think this is one seriously warped love. The only way this is going to have a "happy" ending, I am not even sure that is the author's desired outcome, would be if our uke gets his memory back. We could see an entire paradigm Shift if that happens. Either way the uke is gonna have some PTSD outta this situation. I dunno maybe an epiphany then a separation, contemplation and then reunion?
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Are they poisoning him? I don't trust them at all.