It took a few minutes for the male's knot to shrink enough to pull free, and Luke gasped as he was finally released. Despite the sensation of heat and throbbing, or maybe because of it, he wanted more. The male was still erect and turned to sniff and lick Luke's swollen cunt. Could he manage another go? Luke squatted slightly, and shifted his new short tail to the side, Any questions about the dog's virility were answered when the Great Dane covered him again, this time plunging directly into Luke's slick opening.
If anything, the sexual pleasure became more intense as the male swelled out and knotted again, jetting more canine semen into Luke. His insides were changing, organs rearranging to make room for a womb that was already getting visited by sperm from the first mating. This time, however, the male did not try to pull free. His forelegs clamped tight around Luke's chest and he humped energetically, each thrust providing more semen.
It was hard to focus with such intense need and pleasure, but Luke managed to twist his head around enough to see that he appeared to be a Great Dane bitch from the waist down, and fur was spreading up to his chest. Each shot of semen from the male seemed to increase Luke's change, yet all Luke wanted was to keep going. He was dimly aware of his arms altering, fingers closing up as his hands turned into paws. And still the male kept humping, oblivious to anything but his own pleasure while Luke's head flattened and pushed out into a dog's muzzle.
When the male finally twisted and stood tail-to-tail once again with Luke, they appeared to be two normal mating Great Danes. Luke felt confusion now as the lust and need to be mounted faded. He was definitely going to have puppies, which meant being a dog... for the rest of her life. Luke whines as the male pulled free, the enormity of the transformations only briefly concerning. As she twisted around to lick her still-swollen cunt, Luke couldn't quite remember why that should worry her. That was her purpose in life, to make puppies. Vague memories of walking on two legs, of being male and a different type of creature flickered and went out, leaving only the thoughts of a content and fulfilled Great Dane bitch, which was what Luke had become.