That pegasus didn’t need to be asked twice. His efforts doubled as he drew in deeper and deeper breaths, each one being forced into the mouth of the mare underneath him, filling her yet further. Her errant moans and the odd squeaks as her swelling body rubbed and pressed against the interior of the carrier became a strange melody, but nonetheless a wonderful one to his ears. While things didn’t exactly start off as planned… the least he could do is fulfill this mare’s request. After all, he did say he’d only stop when she signals him to…
 
The mare felt herself starting to reach the full confines of the inflatable room she was swelling inside, massively ballooned flanks and swollen forelegs squishing and squeaking against the walls as her hind legs were pressed into the back, a firm, bright blush upon her cheeks. The air inside her had found most all the space it could in her rump, and even now she could feel her soft stomach beginning to inflate at a faster rate, each puff from the pegasus forcing it to fill out the space further. She wiggled her hooves as much as she could, the odd squeaks as they rubbed against the rubber just sending a chill through her body from the reverberations. Every so often, a moan would escape her, and the pegasus would just take that as a sign to puff harder and harder, filling her more and more.
 
At this point, signalling him to stop was the absolute last thing on her mind - and she was absolutely sure of that.