This story takes place when the gang is probably 13. If you want to see a picture of what they look like, look up Devianart Phineas and Ferb teenagers.It should be the second one on the list. The pic includes Phineas, Ferb and Isabella.
Disclaimer- I DO NOT OWN ANYTHING OR ANYONE!
...AND HERE IS A BLAST FROM THE PAST...
-Present-
"Come on guys! It'll be fun!" Phineas said. "I don't think our future selves would like us messing with the time continuum." Baljeet said. "Yeah, what he said!" Buford said. Ferb nodded as well. They all heard the back gate swing open. "Hey Phineas, Watcha Doin?" Phineas answered, "Oh, hey, Isabella. We're deciding if we should go to the future and see ourselves. Nobody is agreeing with me." Isabella answered and said, "Ooh! I want to see myself in the future!" She thought, "I also hope I end up with Phineas!" Phineas pointed at Isabella. "She agrees with me." he said.
"Well, Phineas, She agrees with you on anything." said Baljeet. Buford agreed. "Yeah, that's because Girly has a..." Isabella covered his mouth. "BUFORD!" she yelled. Phineas looked at her quizzically. "What was he going to say?" "NOTHING!" said Isabella. Phineas was about to protest, but Ferb said, "On second thought, let's go to the future." Phineas smiled. "Let's get to work then!"
After a twenty minute drive to the museum from Candace, who was now 19, everybody was sitting in the time machine at the museum. "What are you guys going to do, anyway?" Candace asked. "We're going to the future to see our selves." Phineas replied. "You guys are going down, down, down!" She grabbed on to the time machine. "Are you listening?" she said. "Hold on tight!"Ferb said to his sister. "Wait, what?" she asked. Too late. They were all traveling twenty years into the future.
-Future-
Thomas and Marie were sitting next to a digital tree in Thomas' backyard. "You know what, Tommy?" said 9 year old Marie. "What?" said Thomas glumly. "I know what we are going to do today!" she exclaimed. Thomas noticed that a time machine had appeared in front of Marie, and she was going to walk right into it. He grabbed her hand. "STOP!" she wriggled out of his grasp. "What?" she asked he pointed to where she was walking. There sat the younger versions of Phineas, Ferb, Isabella, Baljeet, Buford, and Candace. "Wow, what a blast from the past, right Tommy?" He nodded. "Yeah..." Everybody soon got out of the time machine. Once everyone was out, Marie started circling around Phineas very slowly. "Uh... what are you doing?" he asked. "I feel like I know you from somewhere..." she said. Then she stopped. "Hey, you're in my living room!" Marie exclaimed.
"What are you talking about? I'm right here." Phineas said."There's a picture of all of you guys in my living room. My daddy said it was of him and his friends..."she said. "What's your name again?" Phineas asked. "Oh! I'm Marie and this is Thomas." she said. "And you are?" "Phineas." he answered. "Oh, so that's how I know you! Hi, dad!" Marie said as she hugged Phineas. "What did she just call me?" he asked. Isabella laughed. "I guess your her dad in the future." she said. "Marie, who is your mom?" Marie looked at her, smiling. "My mom is..." Thomas covered her mouth. "Sorry, we can't tell you that. What if Phineas didn't love who he married yet?" he asked. "If he did find out, he would probably be disgusted, making him not marry Marie's mom. Then Marie would cease to exist." Baljeet answered. "Correct." Thomas said. Marie quickly ran to the time machine. "This is a pretty old time machine." she said touching it. Thomas said, "No, Marie! Don't..." The machine blew up. "Touch it."
That's it for the first chapter!