And it's not like it's love or anything. I tend to avoid teacher/student romance for the reason it gives me the icks, but some I have read in the past at least have the teacher and students have real feelings and the teacher says they have to wait until the student, who might be 17 or 18, graduates or becomes a legal adult. That at least I can understand. If you love the student, you don't USE them for sex. If you love them, you wait. One I saw had the teacher wait until the student graduated and then presented himself at the home of the graduate to meet the parents. See, that has honor. Taking a kid and having sex play and then, "We're done, bye," is disgusting.
Definitely. I tend to avoid this kind of stories too, even if some of them are pretty good like "young bad education". Here, tengoku just used some psychologically vulnerable teenagers for fun. They could have been easily replaced with adults, the plot (aka his romance with the MC) wouldn't have been a bit changed and many of us would have fully enjoyed this mangas.
He uses psychologically/emotionally vulnerable minors AND adults, because clearly our mc is vulnerable and post-trauma. He excuses the sex play as therapy, and the attention/pleasure in this context works. In real life, I suspect it's not so hunky-dory "Boom" happy. This is like justifying the usage cause he felt better. Um...yeah, I've heard sex "users" justify that "it's good for them." Right....
I quite like this Manga but it could have been way better without the pedo tendencies of Tengoku