The slave has been practicing holding his breath and Princess Serena wants to test how its going. His training is crucial for his stamina when hes under her ass! She sits with her jeans ass right on his face and holds his mouth and nose shut. The idiot now has to prove himself and show the strict princess the success or, as is usually the case, the failure of his training. He never seems able to stand it for long under her hot jeans ass!