Dark, messed up manga. I think the message about this is possibly being a bystander. In the end, the teacher never did anything and contributed more to the boys suffering by feeding into his perverted desires and not getting help like a responsible adult. Who knows what happened to the boy after...
All his appeal just went down the drain for me because wdym the tan baddie that we could’ve had for the ML was a pale dude that’s in 90 percent of BLs already cmonnnnn.
White on white. So overdone. Just an overall pointless development. Either keep him the way he was introduced, or introduce him the way he actually looks!