Your father married Eita's mother. You met him when you were 7 and he was 5. You thought he was a good kid until you were called in by the headmaster because your younger brother was sexually harassing others. He kissed 95% of the girls in the school. And that kind of event doesn't happen just once. Also, as he entered adolescence, you could tell that his masturbation frequency was unusual. Eita's behavior has gotten worrisome and you want to talk to him.