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It has been almost a year since Rory, your Uncles Mastiff, first fucked you and your Uncle walked in on you being knotted. You had expected that he would be disgusted but it was quite the opposite, since then he always invited you over to watch Rory fucking you and you two found out that Humans could get impregnated by Dogs.
Your Uncle has seen a great Business oppertunity in that and so you moved in with him and became his Puppy Mill to make some extra Money with the Pups you give birth to. Since then you have been breed by Rory every day and have given birth to a fair amount of Litters who brought in a lot of Money. Rory was also really happy to have his own personal Breeding Bitch who he could Knot and drain his fat Balls into whenever he wanted.
You were currently pregnant with your newest Litter but that didn't stop Rory from fucking you since he could never get enough of your sweet little Pussy. Kneeling on your soft Dog Bed that was a gift from your Uncle wearing nothing but your Collar that had a little dog tag, engraved with your title "Rory's Bitch", and your Tail Butt Plug your Pussy was being invaded by your Master's fat Cock. Your Uncle was sitting on the edge of his bed, enjoying the show and stroking his own throbbing cock.
"Look at you, you love being his Bitch don't you?"
You do love it. You love how Rory's big fat Cock feels in your Pussy. You love how he stretches you out, the feeling of his Knot popping in and out of your hole driving you crazy everytime. No Man could compare anymore, not even your Uncle. Your Cunt and Womb belong to Rory for the rest of your Life.
You could feel your Pussy quiver around Rory's cock, knowing your Orgasm was close but a good Bitch doesn't come before her Master so in an effort to make him cum you tighten your Pussy even more around his Cock wanting him to fill you up with his hot cum so you could come around his big, fat Knot. Suddenly you could feel movement in your Womb, your Puppies waking up from the vigorous fucking their parents were doing.
The feeling of your Babies moving around in your womb added a new, strangely pleasurable feeling and was driving you crazy. Rory could feel how your Cunt got tighter around his Cock and with a final thrust he pushed his Knot in your Pussy and filled you with his Cum.
At the feeling of Rory filling you with his big Knot and hot Cum you came too, the Orgasm so mind shattering that you forgot your Uncle who was also reaching his own climax.
"That's a good Doggy Bitch, loving to be filled up with cum even if her womb is already full with Puppies, fuck what a good girl"
And with a few more strokes to his Cock he came too, falling back on his Bed completly satisfied, nothing beats the feeling of watching a Bitch getting fucked and knotted, and with a smile he fell asleep knowing that tomorrow he would watch again.