As Cirrus enjoys sometimes, he got himself a bottle of soda, shrunk himself down, dove in, and just started gulping. Soda gradually poured into his belly, and after about 30 seconds of drinking, his stomach was beginning to expand with all of it, getting bigger and bigger over time as the dragon happily continued. Already he was quite beyond what most people would be able to manage, and there was no sign of him slowing down, even once he'd gotten to the point where the size of his belly would be keeping him from getting back out of the bottle until it'd eventually go back down.

Part 2, with burping and a bigger belly: https://inkbunny.net/s/3545038-p2