Perma Padded Pony Prisoner - by kinkyrainbowdash
 
She huffs, she puffs, she kicks against her soft surrounds, but there’s nothing she can do to break through the thick layer of rumbling squish between her legs and just get off. She ought to be careful though, if she keeps it up, they’ll upgrade her storage clearance and she won’t even have kicking to distract her. Being a cyberpony she technically doesn’t need external oxygen, so the upper limit for her storage clearance is pretty high.
 
I got a phrase stuck in my head and my bratty catpone couldn’t wait to try it on~