If such a situation were real, it would be a serious invasion of privacy. The person being watched without consent would likely experience extreme distress, shame, and emotional trauma.
Well, first of all, stay calm. Try to talk to your little brother in an age - appropriate way. For example, explain that it's a private moment and he should respect privacy. Maybe also use it as a chance to teach him about privacy boundaries.
No, it is not normal. Such behavior involves inappropriate and private sexual activities that should be kept private and not shared or engaged in with friends. It goes against social and moral norms.
Definitely not. Schools are places for learning, growth, and promoting good morals. Sharing a story like that goes against the norms and ethics that schools are meant to instill in students.
No, it is not normal. Such behavior involves inappropriate exposure of private parts and actions which are not acceptable in a civilized and proper social environment.
Definitely not. Sharing such a story involves vulgar and inappropriate content. Bathrooms, whether for boys or girls, are private spaces for people to attend to their personal needs in a proper way. Any form of inappropriate behavior in these spaces should not be glorified or told as a story.
I'm not sure specifically which 'jerking off boy cousins story' you are referring to. There could be many fictional or real - life accounts that might use such a phrase, but without more context it's difficult to say.