Picture in the story is by  WolfDan86 https://www.furaffinity.net/view/31486897/

A male trex found a mysterious air tank in the middle of nowhere. He has never seen it at all in his life. He sniffed it to see if it was food but he decided to bite and eat it but he immediately spat it out of his mouth as the metallic taste was terrible and not juicy fleshy meat he always eats. He looked disappointed for his discovery but he heard a hissing noise and turned around and spotted a hose sticking out of the air tank. He thinks it’s a snake so he bites the hose but that is where he messed up. His belly started to expand bigger and bigger and bigger till it was touching the ground and is as big as his own body. He puts his arms on his belly and once he got really big he spat out the hose and looked at his mega sized belly he seemed to really enjoy that moment

The end