When your mom gets on her hands and knees to open up for Cal to mount her, you try to scream or turn and run away, but her powerful scent supresses your free will. It clouds your mind and slowly breaks apart everything still human within you.
Staying put you have to watch your Shepard-turned pal Cal mount your still human mother. He slumps on her back and his mighty forelegs grip her around her waist.
Cal's eyes are that of a dog now, but they are filled with an eerie glow of intelligence and lust that makes you shiver.
The moment the shepards' huge doggy cock impales your mothers' vagina her facial expression turns into a mask of pure arousal. She bares her teeth, saliva runs down her face and her eyes seem to burn with an inner fire that matches the power of Cal's near mechanical trusts. Somehow you imagine her collar to be glowing, but you can't tell.
Darleen screams at you while dark fur grows everywhere on her body, her teeth grow sharp and her face slowly pushes out to form a black Lab's muzzle. "Watch us, my son, watch Cal invoke the magic. Turn away your last vestiges of humanity. You're already touched by the curse, now accept it!"
While you are still under the influence of Darleens' arousing scent you are kind of forced to watch Cal hammering away on your shapeshifting mother. In the meantime some small part of your still human self slowly vanishes within your soul - and with it a barrier between your human side and the new animal instincts collapses.
You sink to your knees and a slight growl escapes your half-opened mouth. Images of dogs mounting explode right behind your eyes.
The scent of Cal and especially your mother turns you on so much, you have to look down on your sheath. Without much to your surprise your shapechanged cock has grown out of it's furry base and is glistening proudly. You touch it with the tips of your trembling fingers. It feels so good, warm to the touch and slightly moist. Tiny drops of pre-cum spew forth of it's tip, ready to ease any mounting action you'd take.
Darleen's transformation is nearing it's completion and Cal's thrusts are slowing. You know that his knot is expanding just by now and that he will tie to your mother and fill her up with his doggy semen. "This... ain't right..." Your words sound more like barks and growls to you.
Without further consideration you jump up and dash towards the two screwing dogs. You grip Cal by his neck and pull him out of your mother. Her juices and his pre-cum drip of of Darleen's wide open vagina as Cal's huge cock is pulled out with a wet sucking noise.
Cal's growling at you madly and he bares his teeth, but you just throw him to the ground with formerly unknown courage and power that are born out of madness and lust.
Within a second Cal's growls turn into whines, he tucks his tail between his hind legs and then he slinks away, still baring his teeth and staring madly at you. He lays down in a dark corner of the room, watching you. His scent is ladden with anger, but he has accepted you as the dominant male for this occasion.
Your heart is hammering when you turn around to face your transformed mother.
She is turned into a beautiful Black Labrador and the wild and raw power of her new body seems to surround her like a halo.
Her erotic scent fills up your mind.
You look into your mothers' eyes and suddenly her voice seems to resonate withing your skull.
"Very well, my son. I'm proud of you. You dominated your friend Cal. Now what are you waiting for? Claim your prize! Accept your new life and take your last step in being part of my pack. I'm yours, come and take me!"
You look a your transformed mother and notice that you are salivating. Your heart is hammering and your hands are clenched into fists. Somehow your figertips feel like they are becomming sharp claws.
Your cock is still grown fully out of it's sheath and it's powerful lust radiates from your groin and into every part of your body that's on the edge of a wild new frontier.
"Take me, mount me, take me, take me, impale me, TAKE ME, MAKE ME YOUR BITCH!" Your mother's voice explodes inside your head.
As some last barrier breaks away under your mother's telepathic barrage of arousal, you growl dog-like and get down on your hands and knees. You grip Darleen by her doggy waist and aim your cock at her moist tunnel. Your arousal reaches unknown heights as your mother's scent fills you up even more now that you are so close to her and touching her beautiful fur.
With a howl that is born out of your inhuman lust you push your cock forward and into Darleen's vagina. Your first impalement of her was forced upon you some minutes ago, but now your thrusts are born out of your own arousal. You bare your sharpening teeth.
You wildly push in and out of your mother's doggy tunnel and time seems to lose any meaning to you... you've embraced your new life and you are more then willing to accept anything that's to come...