They both grinned at their new equipment. "We're both so BIG!" Duke said as he eyed Johns new equine member. "I know", John the jack ass dicked man replied. "It's wonderful." He scratched himself. "Man does it itch, though." Duke scratched his nether-regions too. "Mine is getting sore." As he said that, his dog-dick ballooned to twice it's size. John laughed and soon found his donkey-dick inflating, too. The two men screamed as their new dicks ballooned in grotesque characters of what they had once been. "NOOOOOOOOO!" The two men yelled. Bigger and bigger their cocks expanded until they were as big as an oak tree and getting bigger. John felt himself topple over and his jack-ass member came crashing down onto his small frame. His body POPped under the massive weight. Duke faired no better when he began to sink into the ground and soon only his two heads poked out. Then his dog-head expanded again and only a giant dog-dick sprouted from the ground. The two giant donkey-dick and dog dick stood there alone. They grew and they grew until finally... they popped.
The Shop-Keep came out. "I should warn you too, it's going to itch. Don't scratch."