Double Diamond Is King sombra's Servant.. King sombra is enormously fat, and sits on, plays with, and uses him as his cock warmer/belly rest. Both of them would be anthro.

Sombra pounded his belly. Like a drum, its thunderous vibrations rang out through the throne room, his entire massive gut and moobs jiggling like jello. He groaned as his fat ripples and shook, the smack still ringing in his ears. Gods, but it felt good whenever he did that.

Another half-second passed before he grew impatient. Scowling lightly, Sombra leaned over his belly - being far too large to stand up easily - and called out: “Servant! What are you waiting for!”

“Coming, your majesty! Coming!”

Almost as soon as the last word left Sombra’s mouth, Double Diamond crashed through the servants’ door. He was babbling what sounded like a stream of apologies, but Sombra had already tuned them out, instead choosing to focus on another sense entirely.

Diamond was already nude, Sombra noted approvingly. His queen must have been doing a good job of training him. His cock slapped against his thighs with every step, and it was hard for the greedy king to keep his eyes from hovering over each and every part of Diamond’s body, from the lean muscle on his arms to his thick, corded thighs, and even to his wide, almost feminine hips. Sombra smirked to himself, chuckling darkly in the back of his mind. Oh, yes. Double Diamond would do well.

Double Diamond bowed low to the ground before him, but Sombra would have none of it. “Get up,” he barked. “And get over here.”

Diamond slowly rose and approached. He made sure to keep his vision below the King’s. “Yes, your majesty?”

Sombra ignored him. “Mm,” he purred. He reached out one flabby arm and laid it on Diamond’s flaccid cock. The smaller stallion startled, but didn’t otherwise react. His member looked smaller than Sombra’s own (which was both good and bad; Sombra couldn’t permit any stallion larger than he in his kingdom, but he always enjoyed stealing their excess size and adding it to his own to fix things), but his tennis-ball-sized testicles hung fat and heavy between his legs. Sombra licked his lips hungrily. He could feel his own balls churning and sloshing beneath his mountainous gut, more than ready to spill their seed.

Not yet, though. “Do you like this?” Sombra asked idly, his sausage-thick fingers still stroking up and down Double Diamond’s shaft. To his credit, Diamond’s cock barely twitched, and he let out just the barest of whimpers. Good. It wouldn’t do for a servant to have no self-control.

Diamond’s mouth quivered. “I will like it if my King likes it.”

Good answer. “Then I like it,” Sombra said. His hand slipped a little lower until it was fondling the top of Diamond’s balls. “In the future, give honest answers to my questions. Lay a hand on my stomach.”

“My King, I cannot touch your person. I - “

“I gave you an order.” Sombra glared down at Double Diamond. “Do you dare disobey your King?”

“No, your majesty,” Diamond quickly said. Slowly, hesitantly, he raised his hand and lowered it back down onto Sombra’s gut. Sombro groaned a bit as he felt Double Diamond’s fingers pressing into his fat, his stomach jiggling slightly around the point of contact.

“Do you enjoy that?” Sombra asked.

Double Diamond nodded quickly. “Very much, your majesty.”

“Very good.” Sombra noted approvingly that Double Diamond’s cock was beginning to rise. A controlled servant was one thing, but a servant without a libido was no use to him at all. “You like my gut?” Another nod. “Tell me why.”

Double Diamond bit his lip and shifted his hips a little. “It’s…just so big. Your majesty. So enormous, so soft, so powerful. I’ve never seen anything like it.”

“Would you like to feel it even more?”

Double Diamond gulped, then nodded.

“On your knees.” Sombra’s voice now had a bit of an edge to it. “In front of me. Now.”

Sombra smiled to himself as Double Diamond quickly knelt down. A crackling black shadow surrounded his horn as he levitated his gargantuan, gurgling gut a few inches into the air.

“You’re going to be my cockwarmer,” Sombra said pleasantly. “My official one, at that.” His own cock, a royal eighteen inches and change, was already hard. It rubbed against the bottom of his fat gut, throbbing every time he lifted it an inch more. “And, seeing as I’m such a bountiful stallion as well, you’re going to serve as the royal belly-rest as well. Every day while I’m at court, you will hold my cock in your ass and my belly on your back as I eat and rule. Is that understood?”

“Yes, your majesty.” This time, Double Diamond’s voice was barely a squeak. Sombra’s grin deepened.

“Then back up, O Royal Cockwarmer. And let us begin.”