Ryan sat by the hedge, his twin inch hard-on poking out the top of his trackies. He began to jerk off when a large german shepard came up to him, sniffing the ground, before sniffing Ryan's feet.
"Oi dog" said Ryan, pulling his cock free. "Fancy a lick of this?"
Instantly the dog began to lick Ryan's cock hungrily, until it was flowing pre cum.
"Yeah, you a hungry boy aint cha"
Ryan then noticed the dog's cock growing hard underneath it. It was red, very veiny, about a foot long and very thick with a pointed tip.
"You got a big dick dog, fancy a quick fuck?"
The dog barked. Ryan laid down, lifting up his legs to expose his ass. The dog didn't need encouragement, as it shoved its cock into Ryan.
"Ahh yeah, dirty fucker aint yah" moaned Ryan, as the dog pounded away on his asshole. It wasn't long before Ryan felt the canine's semen flood into him, causing him to shoot his load, splattering it up his polo shirt. Ryan panted.
"You got a good cock dog, wanna trade?"
The dog barked again in agreement. In moments, Ryan watched as his own cock lengthened and widened to the side of the dog's, becoming a bright red, veins popping up over the thick shaft, as the head became pointed. Ryan felt his pubes thicken into fur, covering his balls, which grew to the size of oranges, as a flurry sheath appeared around the base of his cock.
The dog sniffed its own crotch. where it's own cock had been was now Ryan's human one.
Ryan tucked the dog member back into his trackies, and got to his feet.
"Wanna come with me mate?" he asked the dog.
The dog barked in agreement as the two made their way down the street.