Kouhei already getting lost in the cuck genjutsu, it's joever... but hey at least there's another couple to shag with, so maybe the cuck genjutsu will get stronger and show both guys reaming Mako next time.
Nothing happened between her and the teacher but that jealous girl might screw things up, she might make MC cheat which could lead to FMC sleeping with that teacher anyway
No pasó nada entre ella y el profesor, pero esa chica celosa podría arruinarlo todo, podría hacer que MC haga trampa, lo que podría llevar a que FMC se acueste con ese profesor de todos modos.
I get the feeling that in the latest chapters, the author is trying to clean up Mako’s image: she’s late for the date because she was working hard, and she goes through with the ‘training’ because she wants to save the relationship, since Kohei is incapable of arousing her sexually. If she were to have sex with the teacher or anyone else out of revenge, it might ruin everything.