Cal rammed Katy’s pussy harder, riding her and clutching her hips as he drove his cock into the furry bitch. Peter got sick of watching and came around to her jowls, his cock rubbing on Mark’s as she licked both of their penises and balls.
Cal shouted out, “Dudes, I’m gonna cum soon!” and pushed into Katy even more. To get more leverage he reached out and grabbed her collar with both hands. Katy’s haunches trembled as she felt his cock even deeper inside her. She whimpered happily.
Cal pulled harder on the collar until it suddenly snapped loose into his hands. He continued to pump his cock into the doggie pussy as something incredible happened. The dog was changing. Mark and Peter noticed it too, and the three looked at each other and back at the morphing animal in disbelief, as it continued to lick at the two cocks near its mouth and Cal rode its pussy.
The dog’s face, head and ears were shifting in shape, as long hair spouted from its scalp and the fur of its coat receded, revealing soft, feminine, pink flesh. It’s ass filled out, as two sets of tits disappeared and the topmost pair rounded out and grew. It was clear that the Shepherd was becoming a human female. Still, enraptured by the power of her scent, all three of them stayed hard and continued to have sex with her.
In a moment Cal’s head started spinning—the dog he was fucking had turned into his sister!
“Fuck, Mark!” Cal cried as he rode his sister’s pussy doggie style. “What the fuck was in that pot you brought!”
“Man, I don’t know! I think this shit is real!” Mark replied as Katy, now fully human, took his and Peter’s members deep into her mouth at the same time.
Katy had been worried at what might happen as she morphed back into human form, but it was clear that all of the guys—even her own brother—were overcome by the seductive powers of her female musk. Peter and Mark’s penises slid in and out of her mouth in unison, rubbing aginst her tongue, cheeks, teeth, and each other, while her brother fucked her, even harder now. All three began to moan and grunt as they shot their cum together, and Katy nearly gagged as the massive loads of Peter and Mark filled her mouth. She felt the rush of her brother’s hot seed gush into her tunnel, and she orgasmed wildly herself, shuddered, and collapsed to the ground.
The three sweaty college guys and girl lay there for a few moments sweaty and sticky, while they all caught their breaths.
Katy turned and looked her brother in the eye, “Hey Cal.” She said, and smiled.
“What the fuck just happened here?” he answered.