You finally convince yourself to leave your huge, shaggy friend behind. But before you can even turn around and make your way out of his territory, he playfully knocks to the ground and begins to playfully nuzzle and lick your face. You sputter out a surprise and try to push him away with one of your hands. The dog hops back from your hand and comes at you from another angle. He presses his huge, shaggy bulk against your side while nuzzling and sniffing your ear. You try once more to get up and leave. As soon as you do so, however, you feel the dog rear up and get on top of you. He wraps his shaggy forelegs around your legs and shoves his cock into your ass. You gasp in shock and pain as the dog begins to quickly move his cock in and out of your body. And within a minute, the dog builds up a pleasurable rhythm. In and out. In and out. And with each thrust and pull, the initial spurt of shock and pain that you felt begins to seep away and be replaced with a level of pleasure you've never dreamed about. Your heart beat and breath quicken. What's more is the fact you don't even think of what's happening between you and the dog to be weird or unusual. In fact, it seems perfectly fine to be humped by your new shaggy friend. Like it is the best thing to happen to you in a long while. Now panting with pleasure, you look down at your arms and see them drawing close to your deepening, broadening and lengthening chest and torso. Your hands swell and shrink into thick, rounded paws complete with running claws and pads. Your panting goes up a notch as both of them as well as your face get swallowed up by your quickly growing fur coat. Your now blackened lips and nose push outward from your newly grown beard and mustache as you look back and up at your fellow canine. You smile and pant as your former human clothing sloughs off of your shaggy backside. You then look at your shaggy underside and catch your cock, now red and pointed, slipping into its new home between your hind legs.
The humping of your packmate against your backside no longer feels uncomfortable to you. Instead you found yourself enjoying the whole experience without a single human worry getting in the way. Your packmate then slids off of your back. The two of you now greet each other with a friendly nuzzle or two. And as the last of your human thoughts dwindle away, you find yourself happily looking forward to being a huge, shaggy dog.