That's right, even more Sonic sumos! Shade the Echidna this time.

Commissioned by jack-the-writer from DA who also wrote this backstory:

The delicious smell of food woke Shade the Echidna from her slumber. Her belly rumbled loudly, indicating its hunger. “Oh, be quiet you.” She gave her belly a smack, causing it to jiggle, even after all this time a little surprised upon seeing it every morning.

She’d been sent here by Knuckles, to guard a new emerald that had recently been found in the area. Something about her duty as an echidna, or something like that. Regardless, she was happy for a change of scenery, as she found hanging around Angel Island all day quite boring; Knuckles wasn’t the best conversationalist.

However, she wished that he had told her the emerald belonged to a tribe made entirely of sumo Amazon women. They welcomed her as their emerald’s guardian, and they were all very nice, but they had insisted on feeding her copious amounts of food, much more than she would ever normally eat. She’d been polite at first, seeing how sad and downtrodden they became when she refused, but eventually she lost the battle and became a victim to gluttony. Now she devoured every scrap of food she was given.

Her belly rumbled again, louder this time, bringing her out of her reverie. “Alright, alright! If I get up, will you shut up?” She huffed and puffed, trying to raise herself into a sitting position, something which her new body did not allow her to do easily. It wouldn’t be long, she thought, before she’d be unable to get up from a lying position altogether.

After a few minutes of straining and heaving, she finally managed to stand up, panting and worn out just from such a simple exercise. Her hands grabbed hold of her mawashi, fixing it, as it had managed to ride up significantly during the night. She also adjusted her top, which her breasts were threatening to spill out of. She wished she didn’t have to wear this outfit, this skimpy revealing thing, but she had no choice. Not long after she had surrendered to gluttony, the day came when her Nocturnus armor failed to contain her flabby form anymore. And now, instead of the armor of a warrior, she wore a purple cloth diaper which constantly rode up in between her massive butt cheeks and barely left her decent, as well as a tiny purple bikini top emblazoned with her Nocturnus emblem, nothing more than two small triangles of fabric which barely covered and contained her heaving breasts. The only good thing she got out of this predicament was a lovely purple bandana the tribe had made for her, containing some design of their own making. The only remaining part of her Nocturnus armor were her gloves and wristbands.

Shade set off towards the stone altar her meals were always laid out on, down by the shores of the lake, managing only a slow, awkward waddle. How on Mobius was she supposed to protect the Amazons’ emerald if she could barely move? Unless someone challenged her to a sumo match, she’d be completely unable to do her job. But it wasn’t like she could do much about it now: the tribe would never allow it while she remained guardian of the emerald, and she couldn’t very well leave. So it seemed, for better or worse, she was stuck like this.

She reached the shore of the lake, where she was able to see what her once lithe body had become. Her face had sprouted a prominent double chin, as well as puffy, cherubic cheeks. Her once tiny breasts could now be accurately described as blobs, each as large as a melon and straining her top. She reached up to cup them in her hands, feeling how soft and malleable they were before giving them a squeeze, which caused her to bite her lower lip to prevent herself from moaning due to the pleasure it made her feel. She stretched out her arms, causing the sagging flaps of fat on them to hang down, jiggling profusely.

However, Shade’s belly was the part of her which had become the epicenter of her descent into flabbiness, going from being nonexistent to a round, sagging ball of flesh which hung down to her knees despite the support of her mawashi. It was about the size of a beach ball and was very plush to the touch. Shade put her hand on top of it, and it sank down slightly into it, the soft flesh oozing between her fingers. With her other hand, she reached down and squeezed a handful of flesh, jiggling it with all the strength she could muster. Ripples and waves undulated across her massive belly, which looked oddly entrancing and felt strangely pleasurable, although for the life of her she couldn’t figure out why.

She turned around to get a look at her massive bum, her mawashi disappearing between those two massive, yet firm cheeks, each the size of a watermelon. She gave it a gentle rub, taking in its massive size and plush softness; she still couldn’t believe the massive mark she made whenever she sat down in the grass. Lastly she turned to her legs, which rubbed together and squeaked whenever she walked, or rather, waddled. Her doughy thighs, their fronts obscured by her belly, were easily bigger around than she had been before coming here. Her calves, while still large, gradually tapered, terminating in her petite bare feet, the only part of her that had resisted piling on fat.

Her inspection of her body was interrupted by her belly complaining again, louder than ever this time. Shade giggled, her cheeks turning a light pink. “Oh, all right, fine. It’s time to eat.” She waddled over to the stone altar, filled to overflowing with delicious dishes of every kind. Just the smell was making her salivate. As she approached the altar, every part of her body jiggling furiously from the movement, she had a thought she’d never had before. She smiled, before speaking it out loud. “Perhaps this won’t be so bad after all.”