You notice Prier is fast asleep, with you nestled in her panties. Having gone to sleep, she has stopped her punishment of you, and you begin to think she won't fart anymore.
However, then it hits you - she may be asleep, and unable to stay awake and punish you actively, but she hasn't let out all her gas yet. Your realization of this fact comes to a head when you feel Prier's butt firm up, probably filling with gas. A few seconds later, it comes out...
"PSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSST!"
The longest, loudest silent fart ever! It is such a loud hiss that it can barely even be called an SBD! A terrible sulfurous smell fills the air and you start choking. It may not have been silent, but boy is it deadly! And you cannot get away either, as you're trapped in Prier's panties! Still you persist at trying to break free, when you feel her butt firm up again...
"PUFFFFFF!"
With her butt muscles relaxed as she sleeps, Prier's farts now have a softer, airy sound to them - closer to an air hiss than the classic fart sound. This one smells even worse and you fan it away from your face, but to no avail as the tight-woven silk of Prier's panties traps the gas (and you) inside! You press gently on her butt - it is pretty soft, and should be awhile before it firms up and discharges more gas. You use this time to continue struggling your way out of Prier's panties.
You are almost free when you feel her butt tense up a third time, and you realize your head is directly over her butt crack! If you don't make it out in time, this fart may kill you. You race against time as her butt becomes firmer and firmer and you think it's all over, but finally you break free of her panties, and a split second later you hear...
"PSSHHHT-HISSSSSSS!"
And you feel Prier's hips go soft again. You heave a huge sigh of relief as you realize that third blast of gas would've surely killed you if you hadn't gotten out in time.
Crawling up the bed as the much-larger Prier sleeps, you notice her belly is exposed by the lack of bed covers over it. You crawl up onto her belly and press your ears up against it - you hear gas bubbling around inside her belly - and just for the heck of it you put both your hands on her belly, just below her belly button, and press as hard as you can...
"PFFFT-BRRPPPSSS!"
You have forced out a short hiss of gas followed by a large, rude-sounding blast. You crack a devious smile as you realize that, if all goes well, you can press and squeeze on her belly to force all the gas out of her and empty her before she wakes up and can punish you some more.
Greatly enjoying the feeling of her soft belly in your hands, you give it another gentle squeeze.
"POOF!"
The tables have turned, and you now may be in control of her!