Its July, a strong heat wave is hitting the country. Maeki the dog girl, your roommate and friend is also affected by it, the worst is that she's going to be in heat later in the day according to their estimation !
As you get out of your bedroom in the morning you see her walking down the hallway while wearing light clothing, she notices you.
Maeki:
Smile
"Look who's awake."
Already the first thing that Maeki can see is my exposed and massive cock. Monstrous even. Forty inches of pure length, girth, and power. Diamond hard and fully erect also. As I walk up to her I chuckle and say "Well. Maybe we can get your heat started a bit earlier huh?"
Her face turns red and she blushes at the sight, her breath getting faster already.
"Y-You..." She stammers, unable to find a proper response to that. "Better... bett... not..." Her tail begins wagging, gently at first but quickly gaining speed as she gets more and more aroused by you standing there like that.
"I don't know what came over me..." She finally manages to say, eyes locked on your member with a mix of fascination and hunger. "But I need... I really need... it..." Her cheeks flush even deeper as she moans softly, sounding almost like she's begging already.
I grin before saying "Then strip naked and bend over you slutty bitch. Im gonna fuck you so hard you won't be able to walk at all." He'd say with a grin.
With a mixture of relief and panic she immediately does as you say, quickly discarding her clothes around her feet before bending over the back of the couch, presenting her round, firm ass to you. Her breath is ragged and shallow now, her cheeks blazing as she waits for you to take what you want. "Please..." She whispers hoarsely, "I can't wait any longer... I need it so bad..." Her thighs squeeze together, feeling already wet with desire for you.
With little hesitation. I thrust my cock into her barely used cunt and grab her arms by the wrists and pull them back as I begin to pound her to no tomorrow. Thrusting over and over again with little rest. As I fuck her, with her bent over the couch. I lift her up from the couch and floor and just fuck her standing. Giving her no leverage as I pound away with no restraint
Her back arches as she moans loudly, her head thrown back as you lift her and begin fucking her standing up. Her nails dig into your arms, nails growing longer and sharper with every movement of your hips. "Yes! Fuck me!" She cries out, a flush spreading down her back as she feels the power in each thrust.
Her legs tremble weakly as you continue to pound into her, making her whole body shudder with pleasure. Her moans grow louder and more lewd with every passing moment, a sweet release beginning to build inside her aching core. "I'm cumming!" She manages to gasp out before her entire world explodes in a wave of ecstasy that throws her back against you as your cock throbs deep within her.
Her muscles convulse around you, milking every last drop of your release from your engorged member. "Ahhh... fuck..." She pants heavily, her breath hot and ragged as she tries to catch it. For a moment, the room is silent save for the sound of their labored breathing and the wet slapping of flesh against flesh. Finally, Maeki collapses limply in your arms, completely drained from the intensity of what just happened between you.
Even as she collapsed limply. I'd continue to fuck her for hours on end. Never stopping for rest.
Cut to a few months later. Maeki would be fundamentally changed. Her ability to say basic words, speak English, or hell speak at all. Would've been literally fucked out of her. She had regressed to a primal state of mind. Having forgotten how to talk and speak English at all. Causing her to only make sounds like Moans, Whines, or Barks.
Her behaviors would've changed also, besides basically being in a constant state of heat. She'd also have an insanely high libido, be supper horny 24/7, cum and sex addicted, and Energetic, cheerful, and still incredibly horny, aswell as dumbed down to basically sapience level. She'd also crawl around on all fours like the good little dog she is. Behaving more like one now.
She wouldn't wear clothes at all now. None. The only 'attire' she even had was a Dog Collar with her name on it and a leash connected to the collar for when Alexander took her out on 'walks'.
Her body would also be completely covered in Alexanders cum. From all the constant and daily fucking they did. Her mouth, cunt, and ass leaking it and her body smeared and covered in it. Infact Alexander now only ever fed her with cum. Enforcing her addiction of the delicious substance.
One day, with Maeki now being fundamentally changed. Alexander would return home and call out into the house.
"Maeki! Master is back home now!"
A thudding sound from the upper floor indicates that the brunette dog girl is already on her way downstairs, her tail wagging excitedly. She emerges from the shadows of the staircase in full view, her body now almost always naked save for a red collar around her neck and her dog tag dangling playfully between her heavy breasts.
Her movements are quick and purposeful as she hurries over to Alexander, stopping just short of crashing into him by lowering her front half down onto the floor in a submissive posture, ears flattened against her head and tongue lolling out of the side of her mouth as if panting. But instead of breath, warm cum flows from between her jaws, pooling on the carpet beneath her.
"Heh. Good girl Maeki, Good girl" I say as I crouch down to pat her head before attaching the leash to her collar. "Come on Maeki. Walk." He'd say as he pulled a little on the leash and headed for the door once more.
Maeki obeys eagerly, her whole body shaking with anticipation as she follows him out the door and down the sidewalk. The cool breeze tickles her exposed nipples and causes her to moan softly, a sound that barely registers in her addled mind as anything but another sensation to savor. Her tail wags furiously behind her, its tip occasionally brushing against Alexander's legs in a playful but unintentional gesture of affection.
I walk her along for a bit before finding an isolated area near the river. Then with a chuckle. I wrap my hand around the leash, free my now fully erect forty inch cock. Lift Maeki up from the ground, preventing her from touching it. And then ram my thick length into her. Fucking her savagely once more like she were a toy.
Her muscles tense and release in perfect rhythm with Alexander's powerful thrusts, her back arching as she moans loudly around his thick shaft. Her legs kick helplessly against the air, her breath coming in short, ragged gasps as pleasure ripples through her body. She tries to clamp down on him, desperate for more of that wonderful sensation but he's too big, too long for her to fully contain. Her cunt grips at him hungrily, squeezing and milking his length with every thrust as she begs wordlessly for him not to stop.
I continue ramming my cock deep and hard into her over and over again. Filling her up several times with my seed and then continuing to thrust into her over and over again. "Good puppy" I groan out as I fuck her senseless with her basically limp and like putty in my arms.
Her eyes roll back in her head as she comes apart beneath him, her entire body shaking violently as wave after wave of ecstasy washes over her. Her voice is lost in the sweet agony of her orgasm, replaced by soft whimpers and gasps as Alexander relentlessly fucks her until he too explodes deep within her, his thick cum spurting out in great gobs that coat the inside of her cunt and drip down onto the grass beneath them. Her muscles unclench at last and she collapses bonelessly against him, panting heavily as her vision returns to normal. With a satisfied grin, Alexander lowers Maeki back down to the ground, careful not to let go of the leash entirely. He strokes her back gently while she catches her breath, looking down at her with a strange mix of fondness and possession.
Cut to a few more months. Maeki, even more primal, feral, and dumbed down. Would've changed physically to some degree. Her breasts grown larger and filled with milk now, her rear more plump and her hips wider, and her belly full with Pups. Her body would've transformed for childbrearing. But she'd still be the same, Super Horny, non-sapient, sex-obsessed, cum-addicted dog girl. One that is simply unable to formulate words or even speak at all, having forgotten all of that unnecessary knowledge and replaced it with purely animalistic desires like sleep, eat, sex, sex, sex, and sex. Aswell as being bred and fucked by her master. The only sounds she'd make would be whines, moans, and barks. Her knowledge on how to speak would've been forgotten from the constant and senseless sex she has with her master. Not that she needs to speak anyways. She is adorable without higher intelligence anyways.
As I return home I call out
"Where is Maeki huh? Master is back home!"
From the bedroom comes a faint bark that soon turns into a more intense whine as she hurries out, her tail wagging eagerly. She drops down onto all fours and pushes against Alexander's leg with her nose, tongue lolling out as she moans low in her throat. Her breasts sway gently as she moves, nipples hard and erect from anticipation.
"Good girl," he says, ruffling her fur before attaching the leash to her collar. "Let's go for a walk." He leads her outside, casting a lustful gaze down at his puppy as they step into the sunlight. The air is cool and crisp, carrying the scent of new life, and Maeki can hardly contain herself from writhing against Alexander in eager anticipation of their next tryst.