The female jaguar followed the newformed instinctual motions her body made her want- she got on her paws, turned her back to the male and thrust her tail aside, giving him a view of her slit. She felt his breath on her as he smelt her pheromones, followed by his firm shaft pressing at her- and sliding inside, making her yowl in satisfaction.
Once the male jaguar had entered his mate, he shoved inside her until he bottomed out, then began to pound her hard and fast. He bit her neck carefully to hold her steady as his hips thrust at her, and drank in the scent of her body as her heat took hold in response to him.
Thanks to that heat, the female felt transfixed by her mate- his smell was strong and intoxicating, his biting was painful in a weirdly arousing way, and his body atop hers felt irresistibly firm. But most intense of all to her was his phallus. Its spines raked against her vaginal walls and not only made her go into heat, but also made her ovulate, eggs settling into place to get fertilized.
His thrusts continued to grow faster and firmer, and he grew still more intense and intoxicating to her. She knew he would make her pregnant with his litter, and the thickness and firmness of his cock was making her desire it.
Likewise, the male jaguar reveled in hearing his mate yowl in pleasure and clench tightly around him. He felt satisfied beyond words at knowing soon he'd give this female his seed and pass on his genes. She would be made indelibly his mate, and they would have cubs together.
Eventually the male reached his peak, released his grip on the female's neck and roared with pleasure as he hit his peak. The female felt his seed splurt from the tip of his cock, and her pussy clenched tightly in reaction to the warmth of the semen and the pulsating of the phallus inside it. This made the male cum harder still, and soon the female's womb was filled to the brim with his ejaculate.
Naturally, this meant countless sperm of the male were surging through her depths, and soon came upon her masses of eggs. Every single one of them was crowded around by sperm and fertilized, and so a litter of jaguars were rapidly conceived.
The two jaguars licked at each other's snouts contentedly as the high slowly began to subside.