The cougar and the fox lay on the rock, her mates knott holding them together, but neither minded, they just lay there, enjoying eachothers company while she also enjoyed the sloshing feeling deep in her womb.
However the virus had other plans, due to the mating it had begun to rapidly change their genetics, now they would both be in permanent heat, the female cougar would always be able to get impregnated, even while pregnant, once the virus had completed the genetic coding it began to mutate the both of them.
As both male and female mates lay on the rock, they both felt something change, but they couldn't tell what, "well I guess we should head back home stud" said the cougar, as she slowly slipped his still erect member out of herself, that's when she noticed her slightly changed figure.
Her breasts felt heavy and full, and were much more perky than before, rounder and bigger, easily an H cup, and her ass was much more bouncy and firm, she guessed that if she wanted to she could use her ass as a shelf given its new size, her hips had once again widened, to the point where if she were to birth cubs, it would be easy as breathing, and finally she noticed a slight weight resting in her pelvis, and it was warm, but she payed it mo mind as she swayed her hips to her mate as she walked, looking behind her and giving her new ass a quick spank as she walked away with a wink, hearing the foxes footsteps through the brush behind her.
When they were aproching the cave they both could hear sobbing, being cacious of a potential trap they slowly made their way over to the edge of the brush, and outside their cave they saw a female wolf, but she was also and anthro, like them.
But the cougar was having no intruders in her cave, she had built up too many memories to loose her home, so she leaped from the brush, her fur standing up and a deep growl in the back of her throat, then she stoped when she saw the female turn around.
She looked weak, thin, her body nothing but fur and bones, apart from her breasts and belly, the wolfs breast were extremely large, her fur stretched thin to the point where she could see blue veins beneath, then there was her belly, her belly looked like she had swallowed two exercises balls, her legs forced wide and pinned beneath her massive maternal swell.
"Please, you have to help me" she croaked, her voice sounding dry "I used to be an alpha female, but our pack has had a food shortage, but when I drank from the water and turned, my mate began to breed me, none of us knew I would end up like this, so they forced me out" she said with a weak cough, before tears began falling down her cheeks "please, if not me, please help my children, if I can stay alive long enough to birth them then I can be at peace".
Then the virus began mutating the cougar again, effecting her vaginal juces, now she could....