A wonderful YCH done by . I really loved how this looked with so much heft! And tubby dragons getting stuck is always a fun scenario. I wrote up a quick blurb/short story for this, but I might do a longer story for this later. Enjoy a very flustered, and very stuck, Azar!
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Azar's found throughout his life that his inability to use magic has been both a hindrance and a source of inspiration for himself. On the one hand he can't cast spells to help him out in both daily life and when he ventures out into the world and deals with the many dangers. On the other hand, being incapable of magic in any way has pushed him towards more creative inventions that help equalize the field. He's also found that he isn't as effected by things that might have a strong effect on casters, which is its own benefit.
When he was told about a cavern full of pure mana-infused crystals (often called Aetherite), he was informed that spellcasters couldn't enter the cave because the pure concentration of mana in the cave could cause disasterous results for those in-tune with magic. Any spellcaster entering the area would be flooded with mana and find themselves unintentionally casting spells that ended up warped and intensified to a dangerous degree. The risk to themselves, any excavation crew, and the cave itself was too great to try harvesting the crystals. But that's where Azar came in.
Azar wanted to try more experiments using Aetherite as a power source for future inventions in the hope that the melding of the technological with mana as a power source could push his creations to the next level. A deal was made for him to explore and harvest as much as the Aetherite as he wanted before any other crews got there. Without any use of magic, the white dragon assumed he'd be perfectly fine to walk around without harm.
But there was one aspect that Azar hadn't counted on. Pure mana in such high concentrations still entered into his body. The only difference was that Azar had no outlet to expend the buildup of energy within him. And so, his body made use of the energy the only way it could: in the form of stored calories. The deeper Azar went into the cave to harvest the gems, the more mana his body stored and converted into calories that then built up as fat across his whole body.

By the time Azar noticed something was wrong he looked like he'd been eating a hero's feast for a week straight! His belly had ballooned out towards his knees, swaying with each step, and his limbs now felt sluggish and heavy with new weight. Not knowing at the time why this was happening he made his way back out as quick as he could, feeling the extra heft of his body with each step. But he'd gone deep into the cave, and navigating around and through the tight spaces was getting difficult. Every step felt heavier, the sway of his belly became more pronounced as it pushed against his legs, and even his tail was starting to drag behind with extra weight.
The once-slender dragon was huffing and panting by the time he saw the light of the exit in the distance. He had become so laden with excess fat that his belly pressed against the ground, hindering his movement to the slowest of waddles. Every step he made he either had to pull himself forward with his front paws or felt his hind legs bump and push against his lower belly. His limbs jiggled with extra weight that buried the muscle they once showed, his tail was merely a heavy extra weight that dragged along behind him, and he felt the fat bunching up on his neck when he turned to look to the side. But the exit gave him hope he'd get out before he got any bigger. Figuring out how to get back to normal size... well that was a problem for after his escape.
Heaving himself forward as fast as his blimped body could go, Azar kept his eyes on the exit. He just had to make it to that and then he'd be safe! Except, he pushed himself forward and felt a new pressure at the sides of his belly and the sudden lack of forward momentum. Looking back in a panic, Azar saw that he'd misjudged the space between several gatherings of Aetherite and had accidentally wedged his now wider self between them. Desperate and worried, Azar tugged with his front paws, pushed with his hind paws, and even flapped his wings to try and get free, but his big belly refused to budge, and with the passing minutes only grew larger as more weight and fat was added to Azar's frame.

As his paws began struggling to keep reaching the ground, Azar could only worry about what state he'd be found in when a rescue crew arrived a day or so later to check in on him. And if there'd even be any cave left to harvest anything from.