Arthur and the humans
Arthur, Francine, and Buster found something that was a fallout shelter. Before they found it thought true human's went extinct and replaced by anthropomorhic animals. Arthur and them are human from the neck down so same private parts. So they know what a penis is. Arthur and Buster have them. A doctor will see them parts during an exam.
"I hear voices in it," said Arthur, "People it sounds like."
"Let's go see who they are," said Francine, "And bring them up here."
"What is it is Aliens?" said Buster, "That will beam us up their ufo and strip us naked and expriment on us?"
"Let's hope not," said Arthur, "They would experiment on our genitals likes our penises."
"Yes and my vagina," said Francine, "I don't think it is Aliens."
They went down there and saw true humans. They thought they died out long ago. Do to a nuclear war. They only read about them in pre war books. Whiched caused animals to mix with human dna to make anthropomorphic animals.
"Those must be humans," said Arthur, "I thought they were extinct."
"They must be real humans," said Francine, "I also thought they were extinct."
"Looks like they are just rare," said Buster, "Let's go meet them."
"Okay we can meet them," said Arthur, "Let's just hope they are nice and not mean."
"Then we meet them," said Francine, "So we can find out if they are nice or mean."
Them three went to greet them. The human's are shocked to see walking talking animals. That they now rule Earth. They want to know why they wear clothes. They think they have nothing to cover up. But in fact they have the same parts as them. A doctor will see that. Of why they all wear clothes to cover up their private parts and butts.
"Look what rules Earth now," said a boy, "Walking and talking animals. But why are they wearing clothes?"
"I see what rules now," said his mom, "And not sure why they wear clothes. They might not be like us in that area."
"Welcome to fallout shelter 3," said a man, "And how do you know English?"
"Thank you sir," said Arthur, "And that is the only lanuage i can speak in."
"That makes sense," said that man, "This doctor will exam you. To check for radiation and such."
Arthur knows that radiation is gone. He knows it is about their bodies. See what happens next chapter.