You stare at the big male and get another sloppy lick that makes the fur spread further down your arms. He's turning you into a dog! But that is exciting to you, not scary. You pull off your clothes using yout new teeth and clumsy paws, all the time being licked byt he friendly Newfoundland.
Your chest gets deeper, and a tail starts to push out over your butt. The dog sniffs around the new tail, and then starts to lick your rump. It feels incredible, and you shiver in pleasure as your legs become dog's legs, your feet become paws, and... your dick shrinks?
The feeling is too much to ignore, and you twist around to discover that your once moderate dick is nothing more than a nub! The reason becomes obvious as small black teats form on your belly. The male is turning you into his mate!
The changes are speeding up now, but the Newfoundland isn't waiting. He jumps up and thrusts into your new opening, scoring a direct hit. As the last human traces fade from your body, you are rocked by powerful orgasms of a Newfoundland bitch. You realize that you are not only a dog now, but a pregnant dog!