It had taken an expensive sushi dinner, a new pair of shoes, and a foot massage, but Thor had finally convinced Loki to dress like a kitten while they fucked. And it had been well worth it. Loki was on his knees in Thor's room, the little bell on his collar tinkling as he gave Thor a blowjob to die for.

Thor gripped Loki's long, sleek hair with one hand and petted his black cat ears with the other. "Oh, baby," he grunted, arching his back as his little brother slurped at his dick. "Just like that. You suck me soooo good, brother, my little kitten."

Loki mewled at that, sounding so much like a kitten that Thor had to arch his back again as his cock throbbed in pleasure.

Thor wanted to explode after another minute or so. But he held back, pulling Loki slowly off his cock. "Let me fuck you, Loki," he groaned, rubbing his cock along Loki's chin and smearing saliva and precum across his face. "I want to fuck you right now, while I'm so hard and so ready to feel your tight little ass around my cock."

Loki could only whimper pathetically in response, so aroused and needy himself that he had no choice but to obey his big brother. He turned around and got down on all fours, arching his back and wiggling his rump. He had a long black cat's tail attached to the black panties he wore, and it swished from side to side, brushing tantalizingly across his thighs.

Thor got off the bed, grabbed the lube, and positioned himself behind Loki in record time. He pushed aside Loki's tail and the strip of Loki's panties covering his asshole, not even bothering to pull them down. He was in a bit of hurry since he was so turned on, and rather sloppy with prepping his brother's ass for fucking. But Loki was fairly worked up as well, so his hole quickly accepted first one, then two, then three of Thor's fingers. In no time at all he was pushing back onto Thor's hand, whining incoherently for more.

So Thor gave him more. He withdrew his fingers just to replace them with his cock, sheathing himself in one long, delicious thrust. Loki cried out, his insides clamping down on Thor's cock like a vice grip. Thor let out a deep groan and tangled his hands in his brother's hair again, petting and encouraging him gently. "That's it, my kitten. You're so good, so fucking good…ugh, I can't wait to fuck you silly. You're too hot with your little cat tail and ears and collar. I want you to be my kitten forever. I'll keep you here in my room and pet you and love you and feed you cream."

By now Loki was whining and mewling and humping back onto Thor's dick, so desperate for him to start thrusting. Thor grabbed one of Loki's shoulders as he pulled out, his cock scraping against the raw nerves of Loki's asshole and making him scream. Thor chuckled and slammed back in, the tight rippling muscles of his brother's ass feeling like heaven around his cock. "Fuck, Loki," he choked, the intense pleasure almost too much even for him. "Your ass is… oh god, it's just unbelievable."

The bell on Loki's collar tinkled with every thrust, the sounds growing louder and more frequent as Thor fucked his baby brother's ass like there was no tomorrow. The sounds coming from Loki's mouth were also growing louder and more frequent as his brother pounded his ass. Soon his arms collapsed and he rested his head on the floor, his back arched and his ass high in the air for Thor to ravage. The black cat's tail swung back and forth beside his hip like a metronome in time with Thor's rhythm.

Thor began to grunt and groan, rolling his hips in long, hard thrusts. "Does my little kitten want my cream?" he growled, grabbing Loki's hips with a bruising grip.

"Yes, Thor!" Loki cried. "Nngh, pleeeease…"

Thor chuckled. But his laugh was cut off by a loud moan as he suddenly came, his hips jerking against Loki's ass with a few last hard, stuttering thrusts.

Thor collapsed panting on top of his brother. He reached around and took Loki's cock in his hand, squeezing and rubbing the length through Loki's panties. That was all it took to make Loki come. That fucking had brought him to the edge, and a tiny bit of friction was all he needed in order to explode into his panties with a shriek. The bell on his collar jingled along with his spasms.

The brothers slid to the floor in one piece, Thor still inside of Loki. They each took a minute to catch their breath. Thor nuzzled into Loki's hair and reached up to play with his cat ears again. "Mmmm, I'm so glad you agreed to try this, brother," he rumbled.

Loki managed to scoff, even though he was feeling numb and entirely fucked out. "Yeah, yeah," he said, but they both knew that he had enjoyed their little pet play just as much as—if not even more than—Thor had.