I know Perry's naming by the Flynn-Fletchers isn't quite the same as the show but I thought it was too much of a coincidence if Perry's parents gave him the exact name that the Flynn-Fletchers would choose too :/

Perry could not be more excited.

At four years old, he was finally in the pet shop. He was going to be adopted! He was going to have a loving family to take him in, and he was also going to be assigned a nemesis! He couldn't wait.

However, after a few days in the pet shop, he felt very depressed. Many kids had either run right past him or looked at him and made disgusted faces. He felt very sad. He just didn't understand why people didn't like him. He was cute and fluffy, and he had unfocused his eyes in the cutest way possible.

Then, one day, two small boys, an older girl, and their parents came into the shop. "Come on, kids," said the dad. "Pick out any pet you want."

The mother lifted up the red-haired boy and showed him a cute cat. "Look, Phineas! This one's looking at you!"

The father did the same to the other boy and showed him a cute dog. "And this one's looking at you, Ferb!"

Perry felt even more depressed. He was always going to be shunted aside in favour of Calvin the Cat or Danny the Dog.

Then he heard a small boy's voice saying, "Ferb! This one's looking at both of us at the same time!"

Perry knew that meant him. Only he could unfocus his eyes and give the impression that he was looking at two people at the same time. He gave a hopeful chatter.

He heard the mother go, "aww."

The young girl's voice said, "That thing? You're kidding, right?"

Perry hoped they would adopt him.

Carl in his female store employee disguise came over to them. "Is there something I can do for you?" he asked.

"Ah, yes, we'd like that one, please," said the dad.

"You'd like to adopt the platypus?" said Carl in surprise.

Don't ruin this for me, Carl.

"Oh, is that what it is?" said the dad mildly. "Well, yes! May we have him, please?"

"Okay…"

Carl went off to get the adoption papers.

"What would you even name a platypus?" the girl snapped.

Phineas and Ferb both said, "Bartholomew!"

"Maybe he already has a name," suggested the dad.

Perry chattered, hoping that Carl would tell them his name.

When the intern did come back, the dad asked, "Does he have a name?"

"Yes, his name is Perry," Carl answered. "But you can change it if you wish."

"Perry…" repeated Phineas. "I like it!"

As soon as the adoption papers were signed, Perry was put in a carrier and carried out the shop by the Flynn-Fletcher family.

On the way home, they stopped at a photo shop that was doing a special photo deal and had a photo taken of Phineas, Ferb, and Perry. While that was happening, the dad, Lawrence, went out to buy something.

When they got to Perry's new house, Linda and Lawrence presented Perry with his gift: a golden locket in the shape of his paw. Inside it there were the pictures of the two boys and Perry.

The first afternoon at his new house was spent being played with by the two boys, whom Perry was already beginning to love.

In Phineas and Ferb's bedroom, Perry was given a little bed to sleep in. As he curled up in it for the night, he nearly cried at the kindness of his new owners. He opened the locket and looked at the three pictures inside. Phineas, Ferb, and Perry.

He was part of the family. He was Perry Flynn-Fletcher.

Slightly shorter chapter but I'm going to focus on Perry's assignment to Doof and his first mission next chapter :)