Cadance and Chrysalis have a secret relationship, Shining finds out, and in revenge feeds them both to Sombra orally, the two them cuddle and kiss as The two inside digest away with plenty of gas! Weight gain afterwards with the announcement of love!

“Shining!” Cadance struggled to keep the smile on her face. On the inside, though, she felt her heart steadily sinking. “We—I—didn’t expect you to be home so early!”

“Thought I’d surprise you.” Shining leaned against the bedroom door. He quirked an eyebrow. “Well, I’m definitely surprised, anyway.”

Cadance’s eyes darted to the side. She abruptly realized that her legs were still tangled up with Chryssi’s. “Oh!” she blurted. She all but pushed Chrysalis aside, the other mare grunting. “I—it’s not what it looks like, honey.”

Chrysalis groaned. “You had to give him that classic line, didn’t you?”

Shining looked amused. “No; I think it’s exactly what it looks like. Good thing I brought along a friend to help absorb the shock.”

“A...friend?” Cadance said hesitantly.

Shining nudged the door open another few inches. Another stallion came into view, his coat jet-black and his shoulders a little broader and a little taller than Shining’s. Cadance gasped.

“Ladies,” Shining said mildly. “I’m sure you know Sombra.”

“A pleasure,” Sombra said, bowing. Cadance swallowed—then stiffened as she felt an inky-black magic spreading across her coat.

“A true shame,” Sombra said, his voice rich and deep. “I’d heard you were an excellent spouse, Princess.” His horn was crackling with power and energy. He smiled as Cadance floated up into the air, completely unable to move. It wasn’t long before Chrysalis joined her—encased in the familiar aura of Shining’s magic. Cadance looked at her husband in shock.

He shrugged. “Sorry, Cadance.” His horn flickered with Sombra’s, and the two mares slowly floated toward the exiled king.

“What are you doing?” Chrysalis demanded. “Release me!”

Cadance’s pupils dilated when she took in the smug look on Sombra’s face. The legends spoke of how he punished his prisoners, of how he had a certain predilection for— “No,” she gasped. “No, you can’t!”

“I’m afraid,” Sombra said, almost apologetically, “that I most certainly can, Princess.” And with that, he opened his mouth wide.

Cadance shrieked as her head went straight into his gullet, her world turning black in the blink of an eye. She tried to escape, tried to push him away, but the grip of his magic was like iron. Instead, she just felt herself be pulled deeper and deeper inside Sombra’s gullet, his mouth opening even wider—impossibly wide—to fit around her shoulders.

Outside, Chrysalis watched Sombra’s feast with a mixture of disgust and fear. “Oh, no,” she said. “Oh, no. You cannot—I am the Queen—you—” A quick silencing spell shut her up. Sombra’s eyes darted toward Shining in silent thanks, then promptly refocused on his meal.

His neck bulged out even wider as Cadance’s torso entered it, her head already reaching the end of his esophagus. As he gulped her down, more and more of her was freed from his magical grasp—but that just left her powerless in his physical grasp. She screamed, thrashed, squirmed, but all Sombra felt was a pleasant vibration in his throat and belly, which only encouraged him to gulp her down even faster.

Cadance’s hindlegs were the last to go. Sombra happily slurped them up, her hooves vanishing into his mouth as the rest of her filled out his belly. Then Cadance was gone, nothing more than the king’s meal. She squirmed and twisted pleasantly in his belly, mixing up the gases inside. Sombra let out a long, slow belch, then turned to Chrysalis, a hungry flame in his eyes.

Before she could even blink, Shining had tossed her into the king’s waiting maw, this time hooves-first. Sombra’s mouth opened up wide enough to take a full half of her body in at once, his throat bulging even wider than before as he gulped her down. Cadance, an alicorn, hadn’t been small by any means, but Chrysalis was as large as Celestia. Shining watched with awe and no small amount of arousal as his wife’s mistress, too, vanished into Sombra’s sagging belly. Finally, Sombra gulped down her head, and Chrysalis’s panicked face disappeared into his stomach.

Sombra blinked, a deep gurgling filling the room. A beat...and then he burped, louder, lower, and longer than ever before. Shining actually felt his mane shake. Then the king, his belly so large as to actually push him off of the floor, turned his head to face his accomplice.

“You did well,” he observed. His teeth glinted white, and his hooves, raised above the floor by a good five inches, rubbed happily against the sides of his belly. “They were...delicious.”

Lust still glimmering in his eyes, Shining stepped forward and laid a hoof on his king’s belly. Sombra groaned, his stomach gurgling pleasantly as Shining rubbed and massaged its tight surface. “Ooh, yes.”

Shining looked up at him and smiled. Sombra looked down and smiled back. Shining leaned forward, his muzzle up, his lips pursed…

A week later, King Sombra hefted himself down from his throne. Shining watched with amusement and no small amount of arousal as the king’s belly shook and jiggled, the force of the impact setting Sombra’s thick, round rear bouncing like jello. He was almost surprised that the floor didn’t shake, too; with a belly so big that it scraped along the floor as he walked, a double chin verging on a triple, and flanks so thick that either could hold a small foal comfortably inside, King Sombra was the largest, most bountiful stallion he’d ever seen.

The two exchanged a kiss. “The damn thing,” Sombra grumbled as he pulled away, his black cheeks flushing. “It doesn’t fit like it used to at all.”

Shining just grinned. He patted Sombra’s rear, chuckling as he watched the waves of fat jiggle and bounce across the king’s torso and back. “You know you love it.”

Sombra raised an eyebrow. “Perhaps I do.” This time, when they kissed again, there was no grumbling afterwards.