It was a hard decision to make. In one had, she could take the opportunity to snuggle up with her handsome mate, while on the hand, she could spend this time getting her sister to play with her. The collie in her wanted to run and play until she couldn't do it anymore, while the lustful bitch half of her desired to spend her bountiful energy having wonderful sex with Luke.
Looking at Luke, Cina let out a single testing bark, which did make him look up at her. He seemed to understand her plea and got up within an instant. He casually walked over to her and rubbed up against her side as he passed.
Cina felt a powerful urge to do this, and moved her head closer to his ass before taking a sniff. It was not too pleasant, but it had a scent she knew she never would forget. But then she felt something cool lap at her slit and a warmth spread over her.
She needed this.
Sparing no time for playfulness, Cina bowed down and stuck her ass as high as she could into the air. She gave Luke the easiest access to her crotch that she could, and let him inspect her all he wanted. From his cool nose sniffing at her folds, to the wet tongue giving her a taste, her heat continued to build and build. All of it turned her on more than any porn or fantasy ever had.
A thought entered her head while she enjoyed Luke's inspection of his bitch. She pondered if this is how it felt to be in heat or not. While she certainly felt warm with lust, something told her this was lukewarm compared to being in full blown heat. That thought didn't make her desire for sex any weaker however, and she pressed back against Luke's nose to hammer home to him that she was damn horny and that he is taking far to long to do something about it.
That seemed to get the message through to him as he gave her a final lick and mounted her. It took him 3 attempts before he managed to penetrate her, but once he found his mark, he didn't stop. He humped her vigorously, squishing his errection deep inside of her until she felt the bump of her favorite thing slip inside her and begin to swell. Soon enough, Cina was locked around Luke's canine knot and the best part finally began.
With her entrance far too narrow for the bulging cock inside of her to escape through, Cina could only whimper in bliss as Luke repeatedly tugged his knot against her folds. Even if her could manage to force his way out of her, she had no intentions of letting him go, and clamped down hard onto his dick with determination to force him to cum inside of her if she had to. However, Luke was a dog. Pulling out wasn't part of his habits or mentality when concerning having sex with his bitch. According to his instincts, all that mattered is that he needs to pump his bitch full of his genetic material and breed her with it.
After one last strong tug, Cina came, along with Luke. She felt the dog begin pouring his load into her. This was the second best part, though only just by a hair's margin. It's only downside was the bittersweet amount of time this part took. And so, knowing he would be here for a while, Luke swing his leg around her and dismounted Cina, turning to face away from her. They were still connected by his swollen knot, but the exciting part was over.
For the next 15 minutes, Cina laid beside her mate, feeling the continuous stream of semen pour into her quite full pussy. It felt like every possible spot in her sex had been packed full of dog jizz. The warm feeling generating from it though only made Cina happy though. She had thuroghly been bred and was all but certain that she would become pregnant with so much puppy batter inside of her.
As Luke still continued to fill her up more, her Mom/Owner walked into the room and looked down at her pets. "Alright, come on you two. It's time for a walk."
Hearing the "W" word, Luke stood up and tried to follow after her, but couldn't. At least, he tried to, but when Cina let out a pained groan from being pulled a few inches by her still knotted pussy, he had stopped on the spot.
Hearing the sound, Cina's Mom/Owner turned to look at her and sighed with a look of mild annoyance. "Really? Haaaa... how much longer will it take to finish, Cina?"
"It, um... he should be done soon, I think... It's been over 15 minutes already" replied Cina with a rather embarrassed expression.
"Well, detach yourselves when you can. And don't you dare let any of it spill on the carpet or I swear I will have the both of you fixed."
Cina nodded at the warning and then shuttered at the thought of being spayed. So when Luke decoupled from her, she quickly made sure to clean herself up as soon as possible. Thankfully, with her flexibility, she was able to lick her pussy clean even without having the longer face and neck of a dog. So she had successfully avoided a visit to the vet.
With that event all wrapped up, Cina walked over and sat by the door. After Luke was collared and leashed, Cina was then taken by surprise when her mom clipped a second leash onto her collar. "Why do I need a leash as well?" She asked while tugging at it with one of her paws.
"Because it is the law. All dogs must be on a leash when out in public. And that also applies to dog girls too," answered her Mom as she opened the door and walked out. Cina felt her leash pull against her collar and got to her feet quickly before leaping down the stairs after the others.
Being on a leash was demeaning, but she had no room to argue it. But the walk was nice and gave Cina a bit of time to think. Apparently, this reality viewed her far closer to being a dog than a person. People, including her own family, still acknowledged her human side, but in general, treated her no differently than any other dog. Her own mom had used "having her permanently sterilized" as a threat just now, something no normal Mom would ever even think say to their child. That said, if she was considered a dog girl, did that mean there were other's like herself now? And how was she conceived? Did her Mom fuck a dog? Or does this just happen sometimes, like a birth defect or something?
Several of these kinds of thoughts raced through Cina's mind until suddenly she was being let inside of a fenced in area. Looking around, Cina realized where she was and couldn't keep her tail from wagging with excitement. Mom had brought her and Luke to the dog park!