I never could figure out why my kid brother spent so much time in the barthroom. It was always when we came back from school before our parents came home from work. One day, I came home to do homewiork with girl friend. I guess he forgot to lock the door and caught his sitting on the toilette jerking his dick. It was obvious because his pants and undrewaer were down to his ankles and clearly saw his stiff dick before he manage to cover it. He looked so embarrassed and scared about my parents finding out, I made him strip naked and jerk off in front of my girl friend. I think we got so horny, my girl friend later told she got so horny looking at his dick, she had to change her wet panties when she got home. Now she wants to do school homework together every day and end up getting nothing done.