The art was made by the wonderful byondrage
 
I was going to originally name this “A Dash of Airlessness” but, honestly, I already have enough puns at the moment. Not that that’s gonna stop me from putting more jokes and puns in my titles in soon/future commissions. Sorry about that  
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Sketches go from left to the right, left to right, left to right, on each level. Though I guess the time makes it self-explanatory.  
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It looks like Rainbow Dash found herself in quite the predicament. Willing, non-willing? Whatever the case, she somehow was able to take a full breath before beginning these 15 minutes, implying that this was originally consensual.
 
Sketch 1: Rainbow Dash is feeling around the suit she was put in. To her confusion, she couldn’t find any zippers. Whoever put her in there must not have wanted her to get out on her own, a fact that slightly worried the originally-confident Rainbow Dash.
 
Sketch 2: Dash had moved onto her side, trying to stay as limp as possible. Still, the growing panic within her still told her that she was stuck inside the suit, and she couldn’t help but experimentally pull at the muzzle. Her rubber-covered hooves cannot grip onto the muzzle, and they simply squeak off, failing to grab near her mouth at all. The pain is quite bearable, but a bit of her fear seems to be on her face now.
 
Sketch 3: Rainbow Dash has begun to realize that no one was in the room with her. This began to worry Rainbow Dash greatly, because of the fact that she could not get out of the suit on her own. This willing challenge that she had put herself through was getting increasingly more dangerous as Rainbow found more and more about her predicament. It was downright irresponsible to leave her alone when she was like this! Panicked a little bit, she begins trying to signal for someone. Putting her hooves on the wall behind her, she begans pounding on the wall in hopes that her muffles or her clops would signal someone to check on her. As a natural pegasi instinct, her wings attempt to furl out, but the cruel suit stops her wings, keeping them half-opened at maximum.
 
SKetch 4: Rainbow Dash was beginning to find the urge to breathe unbearable, and she quickly falls onto her back, her back arching upwards as her chest began to spasm quite a bit. Her hooves return to her mouth, trying to get a grip on something near her muzzle, trying to do anything to pull the suit away from her mouth. THe indent of her mouth grows deeper as she tries to inhale a bit more air to no avail. Her muffles grow loud as she tries to get the signal of anyone. SHe was nearing her limit, and she needed someone to release her soon!
 
Sketch 5: Rainbow Dash still couldn’t detect anyone nearby, making her panic ten times worse. She was at her absolute limit, and Dash knew it, instinct taking over as she put the rest of her strength into trying to get the attention of anyone who might have been nearby. Her muffles grow into loud muffled yells, Rainbow screaming for help as she began pounding at the wall with a strength that would have broken any regular walls- then again, nothing about this challenge or the room she was in was ‘regular’. Her wings instinctually attempt to unfurl, wasting more oxygen as her wings continue to push and pull against the suit’s bonds. Her pounding became reminiscent of a cat or dog scratching at a door, the pegasi’s great punches becoming a monotonous scratching.
 
Sketch 6: Rainbow Dash had no strength left, and fell over onto her side, barely knowing what was going on. She couldn’t hear her own muffles anymore, and couldn’t tell if she was even trying to signal anymore. Her body refused to obey her commands to get up and do something, and simply laid there, twitching on its own as the rest of what remained of her consciousness begged her body to do something productive. She tries to call out to whoever put her there, not knowing that the one who did it was on the other side of the room, timing her as she simply lay there. 21 seconds left on the clock and ticking.