Sister and Brother Bad influence

Our parents always told that our older sister was a bad influence. First she seduces our brother and now she convinced me to let our brother did me too. She didn't leave us alone and one day we were the three alone at home it append, she gabbed the camera while me and my brother was making out in the bathroom, then we went to our parents bedroom and it append.Me and my brother already used to play with each other but I never let him go too far but under our sister's influence I let things go further. She was always saying she already did it with him and it was good and I, on that time let things go all the way.