"What the hell man?!" Stan grabbed the needle and yanked it out.
Joel stared at the empty needle. All his hard work was now in the wrong body.
"What did you put in that thing? my skins crawling." Stan rubbed the spot where the needle entered. He took
his pants off and peeked into his underwear, checking the injection spot.
Joel watched his brother for changes. Stan wiped his brow. "Man... I don't feel so good." Stan took his shirt
off, trying to cool down. A fine dusting of hair covered his chest, spreading across his back and down his
arms. More hair grew up from his crotch as Stan started breathing heavily. Four more nipples formed on his
chest as his muscles grew.
"I feel so... so..."
Stan's dick poked out the front of his underwear. He shuddered as it continued growing, the tip turning red
and coming to a point. His hand reached up and began stroking his lengthening member. his nails hand grown
longer, becoming more like claws.
Joel wondered what had caused his member to change like that. It had a distinct canine appearance to it...
Joel looked over at the dog. "That's where it came from..." he thought.
"I can't...stop..." said Stan, trying to pull his hand away.
Joel remembered the extra ingredients he had added to make the change more pleasurable, but none of them made
you lose control. Were they being manipulated by the canine DNA?
Stan began stroking faster,his breathing sounding more and more like panting.
"M-make it ssstoooop. Ooooh..."
Stan's pleading was cut short as his nose and lips darkened. His face pushed out slightly. Stan let out a howl
as he stroked ever faster. Joel stumbled backwards, falling over. Stan looked down at his brother. Joel noted
their simple, contented look.
Stan's attention turned to Frisky, as she sniffed at his rear. Joel watched the elastic band tent in the back.
"Wh...what'sth..." moaned Stan. He stumbled to the ground behind Frisky. He sniffed her rear, breathing in her
scent. Instinct began taking a firmer hold as he positioned himself on her.
Soon, Stan was plowing away as Joel looked on. The bulge in his boxers grew longer, forcing the clothing down.
The new tail began swaying back and forth. The base of Stan's cock swelled, forming his new knot. Stan
collapsed on the floor, panting with his long, wet tongue hanging out. Joel went over and reached down to his
brother. He stroked Stan's chest, whcih resulted in Stan kicking the air with his leg.
"Don't...sthoooop..." whined Stan.
Joel smiled as he scratched Stan's belly. After a while, Joel pondered what to do next. He could probably
reverse the effects, but he was really curious about what changes had occurred.
His parents were on a second honeymoon in Europe, and wouldn't be back any time soon.
Joel whistled and then gave a call.
"Stan! here boy!"
At the sound of his name, Stan got up and walked over to Joel.
"Yeth thir?"
Joel scratched behind his brother's ear, Stan panted happily.
"Good boy..."
Joel knew he was gonna have some fun.