My brother made an arse of me when we were kids, he used to depants me at every opportunity, until I caught him jacking off, now, he does exactly what I say so I won't tell our parents.
That was when he was 13, now he's over 20, he must be retarded if he's afraid of you telling the folks.
I would make him do it in front of me and let me watch until he finishes and even take pictures to hold over his head.
Why would holding a picture over his head make him do things for you.
wow what an idiot