"I want to swap with an animal," Viper said as he was always curious about what it would be like to have an animal's cock.
"I shall bring the animal of your choice to you," the demon lord said. "Once it is in front of you just grab it's dick and yank it off. Then place that dick where yours would normally be and it will attach. If you change your mind you can remove yours at anytime and steal a different one."
"Any catches I should know about?"
"Just that you will become more like the creature you swapped with the more sex you have with their dick."
That could cause Viper problems if he's not careful. After all if he chose an aquatic creature and lost the ability to survive on land he'd die. But Viper really wanted to try out an animal cock. After all, what would it be like to have a knot like a dog, or be hung like a horse in a literal sense. Viper had to try this. But what animal should he choose? He could pick anything, but needed to be smart. Viper thought about it for a moment and picked...