Drawn by  Samael colored by me. Send all the love his way for how awesome it is.

This is http://www.furaffinity.net/view/6377263/ as he first appears in the story as told here:

The buff alligator pushed Shippo inside the dark room and the door shut behind him. After the door clicked shut the lights turned on, Shippo squinted his eyes as they adjusted to the light and as his vision cleared he was surprised at what he saw across the room.

Waddling heavily on an extra-large treadmill was the fattest dragon he’d ever seen. His blue body shook as he stomped heavily on the obviously custom made exercise equipment; it was as wide as a two lane road and only had rails on the side, no control panel on the front but a table on the floor in its place. His teal underbelly rested on the table in front of him, each crevice on his belly making a small droopy roll. It covered the table and rolled off the edges as it creaked. On the top of the belly were a pair of plump moobs, they jiggled with each heavy step he took and flopped over the sides of his belly, pushing up his fat arms, which themselves nearly took in his hands with all the weight piled on them.

Downwards Shippo noticed that his legs had nearly done the same to his feet, as pounds of calf fat dragged along the treadmill as he waddled, his claws digging into the fat as he lifted each leg up. Shippo guessed the legs themselves were each wider than two of him put together, behind the dragon was an ass bigger than any doorway Shippo had ever gone through, with a tail to match, each dragged on the floor behind him as he moved.

Shippo looked up at his face, and inset between a pair of fat puffy cheeks that each looked bigger than Zoltan’s belly, he saw a row of sharp teeth and a small pair of dark blue eyes; he saw a small pair of nostrils that flared each time the dragon panted, his head wasn’t very dragon-like though, it was more rounded and he didn’t have a snout most dragons have. Adoring the top of this monsters head were a pair of black horns to match his long black wings, the span of them wider than the treadmill, that flapped on either side of him to cool him down as well as small black nubs along his back and tail.

When I get time, I'll expand (hehe) more on the story whenever I have time.