Kathrin finds out that Alex left home and his bedroom could be the perfect place for having some private moments pleasuring herself. While having fun with herself, Alex is suddenly entering the room. He is full of anger right away and puts the girl immediately in a humiliating diaper position for a good hand spanking. With already bruised buttocks, Kathrin has to fetch the wooden spoon for Alex and gets a hard lesson of such a bad misbehaviour over Alex's knee ...