Big Verena wears tight bluejeans, wich make her big ass looking bigger;-)
She sits in schoolgirlpin position on her slaves face. In this way she has the most controll over him when he struggles.... means: HE HAS NO CHANCE!!!!
Then she turns around and sits reverse in schoolgirlposition on his face and crushes it into a pulp, her enormous weight and the hard jeans are doing a good job.