Jeff felt a tingling him his genitals, looking down at his penis he gasped as he saw it slowly shrinking. Jeff could feel a small tear behind his penis, reaching down he felt a small cleft behind it that was growing larger as his male genitals slowly shrunk into it. Sitting down and spreading his legs he watched as his penis continued to shrink as a scent started to flow from his new cleft.
Sam did not sit idle as his nose picked up the scent of Jeff's new cleft. Sticking his head between Jeff's spread legs he sniffed at his cleft, so close that his nose was touching the cleft. Jeff moaned and curled his toes at the feeling of Sam's nose on his cleft. The stimulation making his penis shrivel faster, his balls already having retreated into his body. Sam pull away after sniffing as Jeff watched the remains of his penis shivel and shrink into it's new home as her clit. Jeff smiled and looked at Sam, nothing as he sat his doggy penis was sticking out of it's sheath.
'Well this is what I wanted.' Jeff thought, turning around her hands and knees, presenting herself to Sam. Sam wasted no time jumping on Jeff, mounted her as he shoved his penis into her virgin hole. Jeff moaned in pleasure as she felt something break inside her, letting her know that now she was no virgin as Sam rutted her. Moaning as both came closer to climax, Jeff screamed as Sam howled as they both came, flooding Jeff's new female dog workings with Sam's semen.
Jeff panted as Sam's knot remained in her stretched vagina, Sam laying on her in bliss as she lowered herself down under his weight. Laying next to her mate, his knot still stuck in her she felt a tingle on her chest and in her ears. Watching small spots form on her chest as she felt her ears extend she watched as the spots quickly matured into female teats, those of a dog, but flesh bubbled up beneath the six teats as her human side had it's way, turning the teats into 3 sets of small breasts.
'Well I did set it so that I would only be part dog.' Jeff pondered as her ears finished moving, leaving a pair of dog ears on her head that heard Sam's breathing, as well as heat on them from Sam behind her.
While Sam's knot kept them together Jeff slowly turned around, moaning quietly as pleasure griped her while she turned until she was face to muzzle with Sam, the akward positioning of her vagina, which was the right place on a dog Made it so it felt weird to be facing Sam while he was in her. Idling noticing as she was now the same size as Sam, give or take a few inches.
Smiling as she faced her mate Jeff feel a new tingle in her...