It was near instant as the gas took it's effects. The plays on the field, and soon after the audience watching from the stands, all shivered and howled in a fiery, carnal delight.
The goth boy tore off his shirt, his skin blushed with heat and suddenly stained with sweat. He slid down his shorts to reach his rod and wildly began to twist and grope at it. His moans became deeper, more gravely, as his body hair began to grow in thick. His torso then began to expand, hair now rapidly layering as his ears began to point. He then howled as he came, spraying himself with his own spunk before he continued to pound at himself with a now clawed, hairy hand.
Similar changes shook others within the purple gas - not just wolves, but tigers and hyenas and lions. All horny, grinning in carnal delight and becoming victims of the flesh. You were frozen, but a sudden howl close by shook you. Another boy, one closer to you, was undergoing his own canine change. You could see a tail hanging behind his exposed legs.
Now panicking you ran up the stairs, like others who were still out of the mist reach did so. You ran and ran though the stamped, but the mist continued to spread.
Even as you sprinted from the stadium, out from the zoo and down the streets you called home. The purple mist grew and curled out and out with no sign that it would stop. You heart was pounding, your mind reeling and everything crashing down around you. Despite this you retained enough sense to keep running and soon you ran into your home and slammed the door shut. You took a deep breath, relived, and then panic set in. You rushed to lock your windows and doors, padding the bottom of any door to outside with towels and other items.
Then, when all seemed well, you collapsed on all fours exhausted. You had made it from whatever that was... but now there came the problem of what you were to do now.