Riku was hungry.
The boy writhed underneath him, trapped in his coils, thoroughly unable to resist or escape. He'd had to put effort into catching this kid, but boy, was it worth it. The weapons his prey had been carrying were thrown to the other side of the clearing. His meal was strong. He liked that.
With a quick squeeze, the boy was immobilized. Riku lowered his body and slithered into a smooth arc. He placed his own face right in front of his food's.
"You'll regret this," the boy growled. "You'll regret hurting Sora, the Keybearer."
I doubt it, Riku thought. He flicked his tongue out and licked the boy's face. Sora the Keybearer tasted amazing, like nothing he'd ever tasted before, rich and smooth and all Riku wanted was to have Sora filling him up, so he'd better get started.
He opened his mouth and latched onto Sora's forehead. He sucked and sucked on Sora's intensely flavorful skin until he was ready, ready to drop his jaw and begin to swallow. Combing his teeth through Sora's hair, he used his tail to ease Sora's body into position. Sora was helpless. Now that he had a good grip, his meal was going down smoothly, helped along by the fact that Sora the human had no scales, claws, or fur.
Sora continued to struggle, of course. He kicked and bucked. That only made the experience more enjoyable for Riku, who as a general rule preferred to wrestle his prey into submission. He tightened his grip even further, so that Sora almost wasn't able to breathe, but just barely kept him alive, just to feel him squirm. As he worked his lips around Sora's shoulders, he worked his coils around the rest of Sora's body, tenderizing his meat.
Riku stretched his throat to the limit and pulled in Sora's arms. Sora's pathetic flailing helped him along, propelled him down Riku's throat and into his waiting stomach. Riku hadn't had a full meal in much too long. His digestive muscles relaxed, opened themselves up, pulled Sora down and welcomed him into their folds. The slightest weight dropping into his belly made his entire body shiver with delight, but a whole person? Now, that was a treat.
Sora's waist was slimmer than his shoulders, of course, so that slid into Riku's hungry mouth easily. His lips caressed Sora's slender abs. His teeth carved tiny rivets through Sora's skin; the blood released from the wounds filled his mouth with intense flavor. His eyes rolled back into his skull and he moaned with pleasure. Sora thrashed but was held easily in place by Riku's body.
His stomach wasn't large enough in its relaxed state to hold a human boy, but it leaped into action admirably, stretching to impossible proportions in order to accommodate Riku's snack. Sora pushed his gut out on all sides, forcing Riku's body to hump awkwardly over a heavy bulge. Naturally, Riku didn't mind at all. He dug his claws into the earth around him and sucked for all he was worth, hauling Sora down inside of him, exactly as he'd do with any other piece of meat he'd caught in his territory. His body was designed to stretch itself around whatever he ate. By the end of Riku's feast, Sora would be immobilized, wrapped up in his innards.
Soon Riku reached Sora's hips, the second obstacle to Riku's hearty meal. They were much smaller than the shoulders, though, and much easier to get inside. Riku's mouth was helped along by each and every one of his muscles, from his throat all the way down to the tip of his tail, working in unison to get his food inside. His tail pushed while his throat pulled. The force was too much for Sora, and his body was disappearing into Riku's greedy mouth.
While Riku finished with the legs. Sora's upper body curled into Riku's stomach, and his belly swelled to show it, though Riku had the situation firmly under control. The muscles in his stomach squeezed Sora into place. Sora's feeble struggles showed through Riku's skin, stretched so taut that the tiniest movement was visible to an outside observer. With only a few inches left of feet and ankles, Riku finished the meal with a loud gulp, sucking everything inside before sending it down with a powerful swallow.
The last of Sora's body disappeared into Riku's.
"Ohhh," Riku groaned, letting out a throaty breath he'd been holding in while he ate. He rolled over onto his side, relieving just a bit of the pressure on his belly, though he still ached with fullness. His large and squirmy meal was causing him some pain, but more pleasure. Riku rested both his hands on his stomach. He massaged himself in broad circles.
"You'll regret this!" Sora shouted again, this time muffled by layers and layers of Riku's belly. Riku found it easy to ignore him, instead focusing on the struggles that sent tiny waves of pleasure through his entire body, from his mouth and throat all the way down to the tip of his tail. He managed to coil himself around his belly, and he rested his head on his tail, preparing himself for a long nap.
"I doubt it," he purred, and he drifted off to sleep, swollen and content.