Patiently waiting for the van to be stopped, Chase and the other dog hid under the back end windows and dragged all shed clothes with them, so people from would not be able to spot them from the outside.
The virus had totally transformed Chase's human mind. He was a part of the infected shepard pack now, too. And he loved it.
Chase's pointed ears caught the sound of opened front doors and of the footsteps of the two humans walking slowly to the back end of the van.
His nose told him that they smelt quite worried, for they did not know what to expect from now on.
He smelt the mechanical reek of oil, too, as both officers drew and readied their revolvers.
The female smelt incredible. She was young and healthy and Chase knew that she would make a great shepard just by inhaling her scent... he had to turn her into a packmate... soon...
Both dogs waited a few more seconds, their bodies ready for the assault that would soon commence.
Chase knew that both police officers were peeking into the rear compartment, but all they could see was a empty room.
The male officer opened the rear doors of the van, mumbling a warning.
"Whatever's happening in there, it's over now..."
As soon as the doors were half opened, Chase and the other dog jumped at the two humans, barking and howling like mad.
Chase hit the females chest, sending her tumbling backwards to the ground.
The other dog grabbed the male's gun with his muzzle, wrestled it out of the officers hand, send it spinning out of the way and then forced the shocked human to the side of the van, teeth bared and growling.
Both officers were shocked out of their bodies, as none of them had expected two big dogs to attack them.
Chase jumped onto the lying female and positioned himself on her, pinning her to the ground with his fore paws on her shoulders. Her gun was lying way to far away for her to grab, as she had lost it while being asaulted by Chase.
Growling furiously, Chase's packmate held the male officer in check by the side of the van, not infecting him by now, to provide Chase with enough time to spread the virus to the female.
They were right in the middle of nowhere, just between two cities. No cars passed by, as the evening twilight drove away the day's light, so no one would be able to observe what would happen next.
Standing on top of the female, Chase looked down on her spooked face. She babbled some human words which Chase didn't understand and her smell was that of pure fear. She tried to get free of his grip, but Chase's new body was too strong for her to break free.
Chase didn't care and started licking her face, while still pinning her to the ground. She had to gulp some of his saliva and her breathing fastened.
"What're you doing to her, bastard..." the male cop grumbled, but he was soon intimidated into silence by Chase's packmates mad growling.
The female beneath Chase looked up to him with widened eyes. Her face was wet with his slobber and he still kept her down. He could feel his exposed cock against his stomach... it wanted to be put to use and Chase knew that this time would be coming soon.
Some minutes passed. Somewhere a coyote howled.
Waiting patiently, Chase looked down on the female cop, panting.
His tail wagged slowly and his cock dripped some drops of precum onto the officers clothing.
Her scent was still full of fear and horror, but Chase's fine nose could already smell the first waves of sweet arousal trailing through her young body as the virus took hold in her DNA.
Eyes opening wide in disbelieve, the mouth of the trapped human female opened partially as a slight moan escaped her throat.
She was beginning to feel the first effects of the infection and scents of a bitch in heat started to fill Chase's nose.
He smelt her vagina lubricate itself as the doggy instinct to mate took hold in her mind, erasing the first human thoughts.
"Katy, damn, what's happ..." the male cop started again, but a sharp bark of Chase's packmember remindet him to better stay put in fear.
Slightly easing his grip on the grounded woman, Chase moved a bit up on her.
The female, now more or less free to move, started to open her jacket, sheding her bra in the same move. Her breasts where firm and round, but already the fur started to grow between them. She started to rub her hardening nippes, still moaning and staring in disbelieve.
Chase moved his cock closer to the transforming cop's mouth and soon placed it's tip on her trembling lips. She immediately grabbed his member with one hand and engulfed the slick thing with her hungry mouth, all the while petting her breasts and nipples with the other hand.
Soon she started to suck wildly on Chase's doggy cock, licking it with her tounge all the time.
The fur started to cover most parts of the females body as she tried to shed all her clothes, which was not the easiest thing to do while Chase stood over her grounded body.
The male officer had to observe his partner suck the black shepard, while her body turned into that of a dog, too. Her hands and feet shifted shape into dog's paws, a tail grew on her backside and her head transformed into a shepard's bitch one not far after that.
He did not dare to intervene, as his fear of the growling dog in front of him was too strong. He always had feared big dogs and this one was big indeed. And it was aroused, too, as the huge slick doggy cock that was fully exposed of the beast's sheath told the cop.
Chase felt incredible as the dexterous mouth of the female sucked at his cock. His member spew forth doggy seed nearly all the time, which she drank all too fondly.
Very soon her body was shaped the way the virus had intended it to be, but her need to be fucked hadn't been erased, it had only intensified with the transformation.
Her heated scent drove Chase mad and he immedialely mounted her fron behind as she got up on all fours.
She did not shy away, she even presented him her wet hole that was more than eager to take in his whole member.
Chase humped away on her, driving his cock deep inside of the transformed bitch over and over again, totally engulfed by her sweet aroused scent.
The male cop stared in horror as his former partner (now a black shepard bitch in heat) was doggy styled by the other male black shepard.
Night had fallen and no car had passed by the whole time they had stopped the police van here.
Then something changed... the other dog which had guarded him all the time slowly walked closer, drooling and ... grinning???