The two of you lay down on the floor together and immediately do a 69. You take in his cock while he gently takes yours into his muzzle. You shiver a bit pleasurably as he plays his tongue up and down your cock and makes it hard. Your balls begin to churn. And before you know it, you are feeding the dog your precious cum while you suck up every bit of his. His is salty yet oddly pleasing to your taste buds.
Minutes pass by as the two of you continue to please and be pleased one another. With half-lidded eyes, you watch something beginning to happen to you. Your nose swells a bit as it darkens and turns leathery. Whiskers sprout around it in mere seconds before they are hidden away by a rapidly growing layer of fur. Soon you are looking down at a thick, shaggy beard and mustache. You let out a muffled murr as you feel more pleased by the sight of your new nose and mustache rather than surprised or shocked. You continue to suckle your friend's cock. But this time you begin to do it more easily as your nose and mouth push outward into a nice muzzle. You smile then as you feel the rest of your body now changing.
The two of you, now content stop what you are doing. Your canine pal gets up onto his shaggy haunches and smiles at you. You push yourself up onto all fours and look down past your new muzzle to see what is happening to your arms and hands. You smile and pant as you watch your arms draw themselves closer to a rapidly deepening, broadening and lengthening chest. They grow a bit longer as your hands, now covered in that same thick and now quite appealing layer, begin to shrink down into paws. Your new friend then gets up, pads on over to you and begins to nuzzle you. A slight jerking sensation coming from your butt tells you that you now have a tail. You nuzzle your friend and then nearly curl upon yourself to lay witness to the narrowing of your hips and the swelling of your loins. Your legs shrink a bit as you stand up on your new hindpaws. You smile and pant some more. Your new friend then woofs a friendly woof at you and coaxes you into following him. Which you do quite happily.
You follow him down the hall till he stops in front of a mirror. He sits and then woofs again. You stop and eye yourself in the mirror. And what you see is another large, shaggy dog. You are that large, shaggy dog. What could better than this, you wonder?