Tell him to stop. If you don't say anything he will just keep doing it. If he doesn't stop tell a teacher or a trusted adult.
Like Salvador said, at this age, it's normal for us guys, but you CAN tell him to stop. He'll be ashamed and that's enough, unless he does something worse like showing his dick, that's gross. But if he just do what you are saying, just ask him to stop.
Don't listen to that other guy, he must be gay for not knowing the feeling of being a teenage guy.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.