For the winner on FurAffinity,  Terrier19. Here is the story:

Stacy the stoat had been enjoying a sunny day at the beach, clad in a bikini as she surveyed the crowds that had flocked to the shore early in the day. The tiny stoat kept a watchful eye on the humans and anthro creatures indulging in the various beachside delicacies, feeling her own hunger grow—not for the food they were savoring, but for something more suited to a predator like herself. She craved a large, meaty, living meal. Unfortunately for Stacy, everyone seemed to be in groups, surrounded by friends or family. This left her feeling frustrated, and she sulked as she strolled in the shade of the palm trees, hoping to avoid drawing any attention to herself.

It was then that she noticed a dolphin anthro crouched beneath a palmetto tree, seemingly lost in thought as he gazed at the ocean waves crashing onto the shore. Stacy’s sharp senses picked up on the enticing scent of the dolphin, and her mouth began to water. She could almost taste him already. With a quiet, mischievous chuckle, she approached him, her eyes gleaming with predatory intent. "Mmm~ Haven't ever had dolphin before," she murmured to herself, savoring the idea.

The dolphin man, unaware of her presence until then, turned his head in confusion at the sound of her voice. As he twisted his body to get a better look at the small creature approaching him, he caught sight of her licking her lips. His eyes widened in alarm as he realized her intentions, but before he could react, Stacy lunged at him, her tiny but powerful body springing into action.

Stacy had managed to grab the dolphin anthro by the head, pulling him down onto the sandy ground with surprising strength for such a small creature. The dolphin’s eyes widened in shock as he found his head being stuffed into Stacy's mouth. Yet, despite the initial surprise, he wasn’t upset. In fact, as he settled into the warm, moist confines of her cheeks, a blush spread across his face, and a smile began to form. It seemed Stacy had found herself an unusually willing prey, one who didn’t mind being devoured by someone so much smaller than him.
For most predators Stacy’s size, swallowing a meal as large as the dolphin would take hours, but for her, it was a matter of mere seconds. She relished every moment, savoring the taste of his smooth, aquatic skin as she slurped him down, not bothered in the slightest by his clothing. Piece by piece, he disappeared into her, until all that remained was the noticeable bulge in her belly. Stacy glanced down at herself, her eyes tracing the obvious form of the dolphin inside her stomach. Her tail wagged happily as she mused, "Not a bad beach treat. Since you're so raw, you're like dolphin sushi. Hee hee."

Hours passed as Stacy remained under the shade of the palmetto tree, content and full. She dozed off occasionally, lulled by the sound of the waves and the warmth of the day, but also spent some time simply watching the ocean, her gaze calm and satisfied. A few beachgoers wandered by, but the sight of a stoat with such a massive, distended belly was enough to send them hurrying away, fearful of meeting the same fate as the dolphin. Stacy didn’t mind the solitude. She basked in it, feeling the dolphin gradually digest within her. As time passed, her belly became rounder and less defined, while the rest of her body, particularly her breasts and rump, grew fuller. Eventually, her bikini, unable to contain her expanding figure, snapped off, leaving her naked but utterly content.

By the time the sun was beginning to set, Stacy’s belly had returned to its usual size, her body now carrying the extra curves she had gained from her meal. As she stretched lazily beneath the tree, the dolphin man suddenly reappeared beside her. He was fully dressed, looking just as he had before, with no signs of the digestion he had endured. Stacy turned her head to smirk at him, noticing the quirky smile and slight blush on his face as he eyed the results of his contribution to her figure.
Stacy tittered, a mischievous glint in her eyes. "A meal I can have again and again? How nice."

The dolphin, still blushing, shrugged with a sheepish smile. "Well... I don't mind."

Stacy raised an eyebrow, intrigued. "Oh? Interesting. I could go for dinner."