Feeling the slick tip of the dog-man-things cock pressed firmly against his butthole, Chase could only slightly whimper in pain.
He was unable to resist the erotic urges that flooded his body and the sight of his own doggy member slowly rising from it's furred sheath only enhanched his arousal.
Lying on the ground of the onward cruising van Chase soon felt his hole strech enough to make way for the slick dog cock that was pushing into it all the time.
The transforing man tightens his grip around Chase's waist and heaves his hips forward a last time.
This time he drives the cock deep into Chase's ass, growling as he does so. He begins nibbling the poice officer's neck with needle sharp fangs and starts pushing his hard cock in and out of Chase's butthole.
Chase moans in ecstatic delight and throws his head back and forth, as the dog boy shoves his penis into his ass over and over again.
His own doggy cock is fully exposed now, too, but Chase is much to distracted by the wild emotions that hit his body with every push of the dog boy's slick member to get a grip on it.
Sensing Chase's members need to be put to use, dog boy loosens his grip of the officer's waist and starts slowly stroking the lone cock with one dexterous hand.
Lying on their sides on the ground of the bumpy moving van, both of them are a sight to behold. Dog boy keeps pumping Chase's ass with his straining cock while stroking the man's member with one free hand. Chase's enjoying all the sexual actions he never believed he'd be performing in his whole life. Fur starts to creep all over his half-naked body and a tail slowly grows out of his lower back.
Nibbling Chase's neck and pumping onward, dog boy whispers quiet words into the officer's pointy growing ears...
"Enjoy the transformation, bitch. I knew you'd be enjoying my doggy cock deep withing your ass... they all love it when the dog spirit transforms their minds. Soon you'll be like me and then we will carry our gift to those people driving this vehicle ... and then, the whole city..."
Chase could only mutter his agreement between rushes of pure ecstasy.
Dog boy's fingers dexterously stroked his straining cock, which all too soon started spurting the last vestiges of Chase's human sperm onto the van's floor. Doogy semen instantly replaced the human jizz deep within his body.
He felt his fingers melt into paws and his face extend into a dog's muzzle as the other guy, who was nearly completely shapeshifted into a golden retriever by now, pumped his doggy seed deep within his ass.
Chase felt more alive like never before and while the virus completely rewrote his DNA his mind was shaped to be part of the pack that spread the infection... his transformation into a german shepherd was complete in body and mind only moments later.