Alex could not believe what he was witnessing....& yet he couldn't look away. His parents were changing right before his eyes, Jack, his father was straddle his wife's back thrusting in & out of her doggy style. Thick black fur creeping across their backs, Alex parents panted wildly tongue slowly lengthening out of the corner of the mouths. At this point Alex felt a very strange attraction to this scene, slowly he reached is paw to his crotch & thrust it down his pants. Alex doesn't notice as he rubs his balls that he was getting hairier by the minute. Meanwhile his parents caught up in their lust hardly notice that they're changing, moaning loudly the pair buck & shake, feet lengthening to hybrid canine form. The scent of his parents pheromones were making Alex extremely aroused, he finally gave in & began to strip. Pulling down his pants Alex could barely contain himself as he slipped his underwear around his ankles & kicked then against the wall behind him. Gasping loudly Alex eyes widened with astonishment at his changing crotch, groping his balls which were covered with soft, curling pubic-fur he smiled sheepishly. Dropping to his knees Alex returned his gaze to his parents change, by now his parents muzzles had fully formed & their bodies were fully covered in thick brown & black fur, their change was nearly complete. Alex balls tingles & itch ed as his sheath developed around his new canine member stopping his stroking for a moment, moaning slightly his new Shepard cock re emerged from it's flap of warm flesh. Two howls blare out as Alex parents complete their transformations. Stroking his erection wildly Alex shows the beings of a black furred muzzle, his tongue thinning & lengthening to keep up with his protruding face. Soft brown fur spread across his ribs & chest while his back became coverd in a dark balck saddle. As Alex masturbated his body continued it's change at an excelerated pace, His buttocks became covered with thick lush brown fur. To distracted by his need to cream his rocks he never noticed his parents watching him as he blew the last of his human spunk all over them, Alex could feel his furry sack filling with doggy giz. Seconds later thick white ropes of canine cum sprayed in his parents faces, his change had completed. Nothing but the sound of the baby barking from it's transformation could be heard as Alex & his parents exchanged embarrassed glances.