Matt looked up with silent excitement as Luke once again positioned himself next to the anthro hydrant, ready to be urinated upon once again by a dog-anthro. A warm, steady stream of piss soon shot out from Luke's red rocket, the Rottweilerman letting his tongue hang out in relief. "Aw man, this is the dog shit, dude!" he said aloud as he leaned against Matt's hydrant head before looking over to Marco. "Feel free to join in!"
"Why would I piss on a hydrant when there's a perfectly good bathroo-" But before Marco could finish his sentence, the prolonged sight of the hydrant seemed to entrance him, along with the sharp smell of his friend's canine urine. "I... guess it wouldn't hurt to try..." he says, walking over to the hydrant. As he did, Marco unzipped his pants and dropped them along his underwear at his ankles and attempted to mimic Luke, placing his hands on the Matt's dome and lifting his leg up with some difficulty.
But as soon as Marco relaxed and let a stream of piss flow out, it felt easier to stand in that position as his legs began to shift and reposition into the shape of dog legs. His mind began to fog over with pleasure as he let his longer and flatter tongue hang out of his growing muzzle. His ears began travelling up his head, growing wider and cropped like Doberman ears. His body began sprouting short, glossy smooth fur all over, brown fur covering his shifting paw hands and feet, under muzzle, eyebrows, and ass, while black fur flourished the rest of his body, including his newly grown, stubby and wagging tail.
By the time the two friends finished, there was a new Doberman dog-anthro standing, panting contentedly over the satisfied hydrant-anthro. "Anyways, like I said," Marco continued, completely oblivious to the changes like Luke. "You can't date sister, Tootsie." he said as if it was a common fact.
"I know, I know. Besides," Luke said, approaching Marco, grabbing the Doberman's new canine cock with one paw hand while grabbing his furred ass with the other. "You know that's not how I swing dude" he says with a toothy grin.
The once straight and human Marco now grinned back, cradling the Rottweilerman's furry balls and ass as well.