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He knew he should stop looking at her. She was his sister, after all. He was supposed to be keeping watch over her and the kittens while his mother was busy laying eggs.

But how could he? The cave was blanketed in ripe, delicious smells, from his sister's heat, to his mother's. And his leonine sibling wasn't making it any easier, curled up with one hind leg over her shoulder as she lapped at her itchy mound. Her pink flesh was perfectly visible as her rough tongue tugged and squeezed, her large scorpion tail sprawled openly along the stone floor.

He flicked his own tail back and forth, ears flat as he watched her. The older litter mates were from his mother's first litter. The young male barely remembered his father, but he remembered the immense manticore, with a huge, dusky mane far larger than his own scraggly beard. He still had images burned into his mind when, as a cub, he'd watched his father claim his mother. The large queen had lain on her belly and held her spined tail to the side, quivering as the huge lion climbed onto her back, biting down hard on her neck to hold her down and hump her into submission. She'd fought and struggled then, but she couldn't (and didn't really want to) dislodge the large male, helpless to resist as he curled his poison-tipped stinger and carefully inserted it into her wet, gaping pussy.

At the time, he couldn't have known that he and his sister had been produced by a strikingly similar mating. His eyes had gone wide when the obscene manticore began to pump his hips and then his tail. Something large and somewhat spherical pulsed down the length of his insectoid tail, and when the huge orb reached his mother's cunt, she dropped her jaw and _yowled_as if she were being torn apart. Perhaps she was, as the huge egg pierced her tight flesh, ripping through her hips to sink securely into her womb. She roared and panted, squealing in pain until her belly bulged with his gift.

Only to do it a second time, ramming another egg into her quivering womb.

The young male knew now, his instincts finally realized, that male manticores were born with a finite number of eggs - vessels filled with everything necessary for life except the shared essence of seed. Each male cub was born with twenty such eggs to distribute throughout his life, after which he was spent and infertile. What manticores lost in longevity they gained in quick breeding cycles - these eggs grew to maturity in mere weeks, after which the female would immediately enter a post-partum heat - ready again.

Whatever had happened to his leonine sire, he'd disappeared after only giving five such eggs to the eager queen. Perhaps he'd gone in search of another female, or met an untimely death on a hunting trip. Either way, he lived on in the male and female cubs, and in the three kittens that played tag on the floor nearby.

His mother's next batch of four eggs belonged to the next most convenient male - he himself. When his father had not returned, his mother's heat had to be quelled by someone. He'd been barely three months old when the large queen had cornered him, chitin-covered tail twitching back and forth. She pounced on him, pinning him on his back, forcing herself on him. She lowered her burning pussy around his trembling tail, rocking up and down while he squealed, drawing first one egg, then another, and then two more. She rocked up and down, riding him as she claimed four of his twenty eggs at once, panting when she stepped off. He lay there dazed - if she hadn't backed off, he might well have pumped all twenty into her tight, wet snatch.

He knew he shouldn't look at his sister, but there she was, teasing him, coating her heat-swollen pussy in slick, wet saliva. His mother was busy in the inner cave, trying to lay his large, kitten-full eggs; she couldn't stop him. And neither could his sister, if he surprised her from behind. He still had sixteen eggs - he could spare another two...or four...or six...for his sis.

But he couldn't. Not really. He had to guard the kittens - one male, two females - that pounced around on the floor, their insectoid tails still soft, their poison still dilute, the girls' wombs still too small to bear a male's eggs, despite the faint scent of prepubescent heat that flitted from their pussies in a pale imitation of his elder sister's cooch.

She purred, staring up at him, her tongue sliding back from her winking pussy so that she could rock her head back and forth along her teats, two adjacent rows of swollen, milk-filled nipples. She was just a yearling, but her body was ready and aching for a fresh litter. He could give her one, and those beautiful rows of mammaries would balloon out over the next two weeks to feed the hatchlings. He found his mouth watering as she lapped and drank at her own feeding spouts.

The kittens were oblivious to their teasing elder sister. They leaped after bugs and pounced each other, and play-stung as they rolled around on the floor. They might not even realize what was really happening if he grabbed his sister when she was looking the other way. They'd watch, confused, as she screamed and struggled, helpless to resist as her brother gave her egg after egg.

But he'd wait. His mother would bear her eggs soon enough, and then she would need him. He wasn't going to let her hold him down this time. No, he'd scruff her like a true male, slamming his tail between her legs. This time, he wouldn't let her stop at only four. Could she fit eight? Ten? His mouth watered at the prospect.

While the young male was admirably restrained, he managed to miss a key detail. He was restraining himself to protect the hatchlings, but he kept glancing over at his broodslut of a sister. She was pretending to nibble her claws now, facing away from him with her rump lifted. Her tail waggled back and forth, showing only brief glimpses of her soft, pink prize, and he couldn't look away.

Which is why he didn't notice when the grey-scaled Cormin slithered into the cave. He didn't even notice the bright, rainbow scales of a female Cormin, deep her in heat, slinking along beside him. The pair of snakes were huge compared to the family of manticores, their heads almost half the size of the adolescents. They'd entered the cave seeking a refuge to breed again, but when they saw the distracted inhabitants, two large smiles appeared on their faces.

Cormins rarely preyed upon manticores - after all, both species were of moderate intelligence, though neither had the gift of speech. But while the grey male sensed a meal, the female Cormin knew quite well a key feature of the manticore breeding cycle. She too, knew of the male oviposition, big, full eggs with the perfect resources to quickly hatch a clutch of Cormins. The eggs themselves were infertile, and would give her a pure-bred batch of snakes. Her own vent was still dripping with her mate's recent cum, a perfect oven to borrow the male cub's clutch.

The large snakes worked quickly, before the kittens could raise an alarm. While the rainbow-scaled female kept to the side, in the darkness, the camouflaged male slid effortlessly over the cubs, coiling around first one female, then the other. He missed the male, who jumped out of the way just in time, but a baby manticore could do nothing to harm the huge Cormin. The adolescents however...

She was too distracted by her little game of teasing her brother to notice until it was too late.