Kathryn strode over to Nate, stroking his fur.
"Nate, be a dear, and head upstairs. I have a few things to take care of down here, than I'll be right with you."
Nate, being the obedient Dalmatian he was, walked upstairs, wondering what Kathryn had in store for him. As he began to wonder, he found himself at the door of Kathryn's bedroom. As he sneaked inside, he found a dog collar lying on the sheets. As he wondered why Kathryn had it, he had a strong impulse to put it on. Immediately after doing so, Kathryn opened the door in some revelling lingerie.
"I hope you like what I got for you Nate, after all, it does suit you very well."
" well Kathryn, if you don't mind me calling you that, it's quite a nice accessory."
"Well Nate, I had to get my puppy a little surprise, didn't I?" Kathryn said, before noticing Nates erection. "Well now Nate, aren't you going to introduce me to your little friend?"
Before Nate could realise, he had thrust his canine cock in Kathryn's mouth, shagging like a mad man.
"I'm sorry, about this Kathryn, it's just that I have no control." Nate said as he blew a thick, creamy white load in Kathryn's mouth. Before either of them knew what was happening, Kathryn's body began to change. Her nails became claws as short black and white fur began sprouting from her mouth.
"Oh my good god, Kathryn. I am so sorry." Nate said before Kathryn put a paw on his mouth.
"Don't worry Nate. This will be over and done with in the morning. Now, fuck my like a mad man!" Kathryn said as her final changes were happening.
Kathryn and Nate leapt up onto the bed before licking each other.
"Wait, Kathryn, if we fuck, won't that mean we'll have a child?" Nate said calmly.
"Don't worry Nate, I can't get pregnant, so we can fuck for as long as we want."
Kathryn then began to turn over onto her stomach, as Nate ripped the last bit of clothing of Kathryn. He then began sniffing and licking her pussy, before sticking his rock hard shaft into her. As he slide it in, he felt a combination of dominance and playfulness. He began to feel horny as he started thrusting his canine cock in her wet pussy. As he fucked her, he got rougher and rougher grabbing her hair and tits.
"Fuck me nate, fuck me harder, harder motherfucker, harder, oh yes, yes fuck yes"
"Respect my authority, bitch. I'll fucking use you as my cum dumpster, you slut."
Nate got his knot inside Kathryn's pussy just as he began to come. As Nate and Kathryn laid back on the bed, Kathryn said "well now Nate, that was quite fun, but now, we're knotted, at least until the spell weres off, or the knot goes down. Which ever happens first." Kathryn then began to go to sleep.