IENE-034 Big Brother, I'll Do It for You. Momoka Nishina

My brother, who is a ronin (a student who has failed the entrance exams), always commutes between home and cram school. He doesn't have a girlfriend, so he masturbates all the time. He finally got to the point where he masturbates while peeping at me and my boyfriend having sex at home... But he confessed that he couldn't concentrate on his studies because he was always thinking about me! Is there anything I can do to help him?