By the way, touching a girl's butt when she expressly asks you not to is sexual assault.
I know that in manga, they usually don't care much about the law; like stalking is normal, hitting someone in the face for no reason is OK, and living alone at 12-14yo, with no guardian, is cool if you're rich... but could we please make it so that when a girl says no, you stop?
If the pain was too much and she finally asked for his help, that would be OK, but what happened is not. Him touching a girl's ass because of peer pressure isn't a good message.