You're ambivalent about proceeding. You're very much in the mood, of course, but the fact that she has the ears and tail of a dog should bother you. The fact that it doesn't bother you does bother you, and the fact that you can't figure out exactly why it should bother you bothers you further. Frankly it's all a bit confusing and you begin to get a bit of a headache from the entire train of thought.
"Come." she says again, drawing the word out in a coaxing sort of way. Lust wins out over...uh...whatever it was that was opposing lust, and you push your rod into her. She moans as and her walls clench against you as you, causing your manhood to swell even more. You begin to pound against her as she moans. Your mind is hardly on lasting long at this point as you're driven by to a height of passion you're almost certain you've never reached before. Fortunately she doesn't seem to mind much as from her cries you imagine that she's approaching orgasm nearly as quickly as you are. Within a few minutes of rapid indulgent lovemaking you find yourself beyond the point of no return. You only barely remembering to pull out before shooting. Your partner, however seems to sense your intention and seems to have other ideas. Each time you try to pull out she bucks back against you, making the combination of pleasure an momentum difficult to allow pulling out. It's not long before you're releasing your load inside her while she howls in orgasm.
Your pleasurable, but brief foray over, you find yourself spooning with her, your member still inside her. You bask in the afterglow for a bit and catch your breath. The feel of her tail pressed against you reminds you of the bizarre phenomenon currently snuggled up against you.
"You...you have a tail." you say still not entirely believing it "And dog ears."
"You like them?" she says with a pleasant laugh.
"Uh...well...I don't know, it's just strange." you admit.
"You'll learn to love them." she says mysteriously. This remark weirds you out even more then you were before. You decide that perhaps it's time to leave. As you try to withdrawal from the dog-like woman, however, you find yourself unable to pull out. Your erect manhood is somehow trapped inside her. She laughs and reaches back to caress your upper thigh as if to reassure you.
"Oh, you're not going anywhere, puppy. You're mine now." she says. You're about to struggle anew but you're distracted by the tingle all over your skin. You gasp as you start to see tan hairs growing up your stomach and the slight itch it gives is echoed down your legs, leading you to believe that the same is happening down there. You start hyperventilating and try again to pull out, but a sharp "No." from your mistres-that is the woman - stops you. You remain still as the fur wraps around your thighs and over your buttocks. You become aware of a tail, much like hers, forming from your tail bone.
"I don't want this." you say as the fur wraps around your back and crawls up your chest.
"Then you shouldn't have put it in. You got what you wanted, and now it's time to pay up." she says.
"I have money..." you say but she cuts you off by reaching her hand around and putting her finger on your mouth.
"Don't want it. I'm getting what I want." she turns your face to her and gives you a peck on the lips "Don't worry, I'll be a very nice mistress to my loving little pet." she says. Somehow that calms you down, but you still squirm slightly as the fur crawls up your back, over your chest and spreads down your arms. Your hands become an odd mixture of human hands and dog paws, causing mild discomfort, but nothing more.
The real pain comes when the fur drifts to your lower legs shift from regular human stance to a digitigrade stance. That's when pain shoots through you on a level you'd never imagined as the bones in your legs break and reform. Not much less painful is the growth of a dog-like muzzle as your skull reshapes, taking on a canine shape as the fur covers your neck and swallows your head. By this time you're knot as decreased enough for you to withdrawal, which you do, rolling off the bed and sitting on the floor, a cry of pain which quickly turns into a howl.
Your mistress is upon you quickly, wrapping you in her arms and pushing your head on her shoulder as she gives you a comforting hug and gentle words. As the changes finally finish you find yourself hugging your mistress back, happy that she's here to comfort you. You reflect on how lucky you are to have such a wonderful-
The thought stops you cold. Your tail behind you was wagging happily as this woman, the woman who turned you into this half-man-half-dog thing gently cuddled with you. She continues doing so telling you that the worst is over and that now you're her wonderful dog-boy forever. The thought, now that you've snapped out of your trance, gives you chills, but a beating in your chest forces you to come to grips with the fact that part of you is excited by the idea. She stands up and helps you do the same. You take some unsteady steps on your new legs as she leads you back to the bed. She digs into the bedside table and produces a collar and smiles at you. Her intent is clear.