After a few days of this routine there came a day when your Master didn't go away at night. He just stayed home and watched some TV. You laid there next him on the couch your tongue hanging out of your mouth loosely. Eventually you get up and went to eat and drink from your doggy bowl. The water soothes your throat as it goes down. Speaking of going down your Master didn't asked you to suck him off, which seems odd for him. Your altered state of dog-mind wasn't really capable of thinking of complex thoughts. You only knew that your Master wasn't in his normal routine, and that makes you uneasy. You go back into the living room barking happily to try and excite your master, but you find he isn't there anymore. You are worried by this, looking for him to be somewhere. You barked for him, and whined, which was as much concern as your canine vocal cords could muster. Then you heard a calling.
"Come boy, come upstairs."
That was your name. Your ears perked up, and you ran up the stairs, barking happily to see your master in his room. Instantly the smell of musk that this room was naturally full of hits you. You lift your dog eyes and see the Master sitting on the bed, his 9-inch rod dangling between his legs, his golf-ball sized nuts full of the promise of more sweet cum. You love to eat your Master's cum, and swallow it down every time. That's just how your mind is, you can't question it. You get up on the bed and start licking his cock to make it swell up.
"Hey, good dog, I don't even have to tell you when to start, ohh, keep it up."
You lick his dick and balls until his rod it fully erect. You start to put his tasty cock in your muzzle and suck, suck, suck. Before you can get far though he stops you with great effort.
"Now boy, I've decided to give you special treatment tonight. You've been a good dog, and after tonight you'll really be my bitch."
Excitement! Your Master is praising you, that makes you happy. By this point in sucking him off your own dog hood had become hard. He then moved around behind you, you start to turn around and get at his wonderful warm cock, but as soon as he says "Stay" you obey without question. He moves behind you and you can't tell what he's doing for a while. Suddenly you feel his hand on your canine asshole, spreading a cool substance around your tail-hole and even sticking his fingers inside to spread more around in there. You have an urge to move around, the feelings foreign to you. Your old mind yelling out curses to this man, but your new dog mind waiting patiently for what your great Master has in store. Suddenly your contemplations are halted by your Master's warm 18-year-old naked body on top of you, rubbing your soft yellow fur. He whispered in your ear.
"Are you ready to be my bitch?"
Your old straight human mind was screaming "No! No! Please no!" but those words never got to make your dog body act. And your body language was all for it. Your red poker fully out of it's warm sheath home and exposed to the air. The air is full of the strange smell of lube, which your canine mind doesn't recognize, lust, and musk. You lick your master's face in response to his question, and with that he proceeded. It's not like you can resist or disagree. Soon you felt something poke at your tail-hole. Then there was a slight pain as your doggy hole is slowly penetrated by your Master's lubed up shaft. You grunt in pain as he continues to ream out your virgin dog hole with his hot teenage cock. Soon he's in all the way to the hilt, his crotch and balls resting against your tail-hole, his dick fully hidden in your warm folds. He moans in total pleasure as you grunt in pain.
"Oh, that's such a hot tight hole you have boy. I can hardly fit my cock inside it's sooooo *Urgh* tight! Your ass is so warm, do you like having my rod stuffed in your virgin hole all the way to the hilt? I know I do."
It still hurts a lot, but the pain is starting to subside and become overrun with joy for making your Master happy. You were such a good dog. And whatever he likes, you like. Soon pain returns to your rectum as he starts to pull his rod out. It's like fire and you whine from being fucked like a little doggy slut. But you love it at the same time. As he works up a rhythm of pushing in and pulling out your reamed virgin tail-hole starts to stretch to accommodate his lengthy member. Soon the pain numbs out and you start to slightly enjoy being screwed on his meat poll. Soon your dog hood is fully erect and pulsing with the pressure of canine horniness. He starts to moan and fill you with his dick and empty your hole out, only to be filled again. Your tongue hangs out of your mouth and you pant with the heat and pleasure of being made a bitch and being taken for the first time. You bend your front down and raise your tail-hole high to allow him to pump his member into your orifice. Your hot Master is taking you doggy-style, how ironic. Soon your cock starts to leak pre all over the sheets. You can't help it, you're to caught up in the heat of mating. Soon His pace increased and he pumped in and out of you with new vigor, moaning at the tightness and amazing feeling of burying his meat in his doggy boy. Before you knew what to do, you shot your canine load all over the sheets, ropes and ropes going out to stain the sheets in a pool of white. Your Master picks up the pace and depth of his thrusts, savagely ramming your canine hole.
"UUUgggghhhh!" Soon he thrust in with power and the way to the hilt, and you feel your dog hole be filled with Master's sweet cum. The sweet white substance fills up your tail-hole, but due to the extreme tightness a lot flows back and leaks out, drizzling all over your rear region and eventually covering your yellow balls in your Master's hot white jizz. You both collapse on the dog-cum stained sheets, your face landing in your own spunk. It was over, you were now totally His bitch. The old voice was terrified and ignored as usual. You breathed hard and started licking up your own cum, your dick shrinking back into it's warm home. Your Master's dick had found a new warm home in your no longer virgin tail-hole. You slowly both pant and fall asleep with his cock still nestled deep inside you. You are still in a bit of pain from being so powerfully taken in the hole, but overall your doggy mind is happy to have pleased your Master. The cum on the sheets was proof enough that your gay canine mind loved to be taken in the ass. You look foreword to more fun with your Master, always content to just make him happy.