Mia and I are both trying out for the swim team again. It's been a while since either of us have competed and we're both feeling a little nervous. When I bring it up to her, she says she's ready, and I think I am too. I say I can hold my breath for about a minute. Mia immediately challenges me, saying I'm not "good at cardio", and I'll probably run out of air way before that. Mia says, on the other hand, she can hold her breath about double my time. Of course, I call her bluff, and challenge her to a breath-holding test. I tell her to lie on the bed, on her back, while I smoosh her under my ass and put her "breath-holding" record to the test. I forward face-sit her, burying her nose and mouth under my pussy and ass. I can see her eyes roll around as she hold her breath under my holds. I tell her this is good practice and also appropriate punishment for the small annoyances of living with her. Mia is still quite confident in the challenge, and I decide to take it to the next level. I cover her face under my thing thong, and sit back, putting my weight on her face and neck as I place my hands on my hips and watch her squirm. Then, she's put to the real test when I turn around and reverse-face-sit her. I cover her face completely up to her forehead while controlling her breath over and over. Mia begins a panic that I notice in-between holds. She's breathes heavily, trying to inhale all the air she can before I take it away again. I've broken her confidence and I'm feeling extra sadistic, as I find pleasure in controlling her. I'm enjoying this more and more sexually, and i decide to take it even further. Mia hasn't nearly reached her supposed breath-hold record, and I'm going to push her to her limit. She's getting dizzy and light-headed, and i decide to teach her a lesson. I hold one last time, before knocking her out completely! Guess Mia won't be making try-outs since she couldn't pass this simple test.